Open-Hole vs. Closed-Hole (French vs. Plateau) Keys Explained

Five keywork decisions shape what a flute costs and how it feels in your hands: open or closed holes, offset or inline G, B foot or C foot, split-E mechanism or not, and a C# trill key or not. Tonally, they matter much less than sales copy suggests. What counts is your hand size, your level and the music you actually want to play. For a first flute, closed holes, offset G and a C foot are the easiest combination; open holes and a B foot usually pay off only once you are further along.

The overview: which keywork options exist

Every option below is a variation on the same Boehm-system flute (patented in 1847). They change how the flute feels, how far down it plays and how you handle it, not how the tone is produced.

Open holes or closed holes

How the two work

On an open-hole flute, five keys (the left-hand index, middle and ring finger keys and the right-hand index and middle finger keys) have a hole in the middle. The fingertip has to seal that hole and push the key at the same time. On a closed-hole or plateau flute the key cups are solid, so you simply press the key. In both cases the same pads seal the real tone holes underneath.

Does it change the sound?

Opinions differ, but most sources agree: with the holes covered, there is no proven tonal difference. Open holes show up almost exclusively on better flutes, with better headjoints, mechanics and workmanship, so it is easy to credit the holes for what the whole instrument delivers. A few voices describe open-hole flutes as slightly freer or richer in overtones, but nobody has demonstrated it. Tests with flat, airtight plugs found a pitch change of under one percent even on the hardest note to bend (E2), and no audible change in tone.

The real difference lies elsewhere. With open holes you can half-cover a hole on purpose. That makes glissandi, quarter tones, multiphonics and small intonation fixes possible. If you play standard classical repertoire, you will not miss any of it. If you want contemporary pieces, music from the twentieth century on, or folk-style pitch bends, open holes get you there more easily.

Feel, hand position and weight

Closed holes are more forgiving. Fingers may land a little off center and the hand does not have to be perfect. That helps children, small hands and players whose fingertips do not yet seal reliably. Open holes force clean hand placement. Supporters see this as a learning advantage, because sloppy technique shows up at once as stray noise and missing notes. Critics point out that air leaking through the grooves of the fingerprint, and an awkward wrist angle on the G key, are avoidable hurdles, particularly with a shorter little finger.

The weight difference between open and closed is hardly noticeable, and no measured figures exist. A B foot and a split-E mechanism add far more weight than the holes do.

When open holes are really worth it

• Beginners and children: closed holes. Repertoire that truly requires open holes is all advanced.
• Intermediate players: a switch to open holes can make sense when contemporary pieces come up or when you want to train your hand position on purpose. It is not mandatory.
• Advanced players and professionals: personal taste decides. Many professionals play open holes, others deliberately do not.

Plugs: the middle road

Many open-hole flutes ship with plugs, and plugs can be added to others. They are small silicone, plastic or metal discs that fill the holes from above. With plugs in, the flute behaves like a closed-hole one. You can then release the holes step by step, for example the three left-hand rings first and the rest later. Silicone is generally considered more pliable and seals better than hard plastic. Two common sizes exist (about 7 and 9 mm), and the right one depends on the model. To remove a plug, pull it back out in the direction it went in rather than pushing it through from the top, which can damage the pad or retaining ring.

Plugs also help players with hand problems such as arthritis, bent fingers or an injury. What matters is that they sit flat and tight, because loose plugs cause leaks.

Conversions, in general terms

Inserting and removing plugs is something you can do yourself. Anything beyond that belongs in a repair shop: permanently converting open holes to closed cups, work on the rings or pads, or extending an inline G key. These jobs involve soldering and fitting, and the price varies by shop and instrument, so get a quote. If you are unsure, try both versions before you buy, because switching later usually means buying a different flute.

Offset G or inline G

On an offset G the two G keys sit a little closer to the player than the other left-hand keys. Your ring finger, which is shorter than the index finger, has to stretch less. On an inline G every key lies on a straight line, which can feel natural to longer fingers.

Tonally there is no difference, and mechanically both systems work the same way: one press operates both G keys. Boehm's early instruments already used the offset layout. The old cliché that inline is "professional" and offset is "student" has largely been debunked. Inline was more common on advanced flutes in the 1980s and 90s, but today many professionals choose offset on purpose for hand health (tendon and carpal tunnel concerns). Some makers, especially French ones, still build their open-hole models mostly inline, so offset plus open holes is not available everywhere.

As a rule of thumb: small to average hands and beginners go with offset; with very long fingers, try both. The decision belongs in your hand, not on a spec sheet. In some cases an inline flute can be made more comfortable with a key extension, which is workshop work. Switching systems later essentially means getting another instrument.

B foot or C foot

What a B foot changes

The foot joint is the short bottom section. On a C foot, middle C is the lowest note. A B foot is about an inch (roughly 2.5 cm) longer, has one more key and reaches a half step lower, to B. It is heavier, and it comes with a gizmo: a lever that helps the top C (the fourth-octave C) speak. A D# roller often goes with it, letting the right little finger glide between the foot keys.

Tone and practice

The added length and weight bring a little more resistance and a tendency toward a darker, warmer tone. The third octave sounds less shrill, and its intonation benefits. The effect is subtle. Many players still prefer the C foot, finding that low notes sound too low on a B foot and that the flute takes longer to warm up. A popular assumption says the C foot is only for students and the B foot for professionals. That is not true either: the choice follows the sound you like. Brighter, pick the C foot; warmer, the B foot.

The low B is rarely needed. It turns up in some orchestral pieces and in flute-choir arrangements, and most of the repertoire never touches it. One working professional reported using it about three times in twenty years. If you have no specific use for the low B, a C foot gives you a lighter and cheaper instrument. In the United States, the B foot is the standard on step-up and professional flutes and is considered easier to resell.

Retrofitting

A B foot can be bought as a separate part, but a repair shop usually has to fit it to the flute, and the old foot may no longer fit afterwards. Quotes vary by shop.

Split-E mechanism and C# trill key

Split-E mechanism

For the third-octave E it helps if one of the two G keys closes with it. The split-E mechanism does that through an extra lever: that key stays open for most fingerings and closes only for high E. The note speaks more easily, sounds steadier and sits better in tune. The mechanism adds weight and cost and cannot be retrofitted. It is usually offered only with offset G. Many step-up and professional flutes leave it off because it is widely believed to affect the quality of the high F#.

In practice it is no must-have. High E can be played securely with air control, embouchure and harmonics practice. If you struggle with E in the early years, the mechanism helps; orchestral players and audition candidates often choose it deliberately. One option is a so-called high-E facilitator, a small disc with a hole that a repair shop can fit and remove again. Do not buy a flute for the split-E alone. As an example of the extra cost, one professional-grade model offers it as an option for $150 (Oct. 2026).

C# trill key

The trill key eases the B to C# trill and improves pitch and clarity on an open C#. It also helps with awkward trills and tremolos, such as high G to A. You mostly find it on step-up and professional flutes, and beginners can do without it.

Which combination suits which level

Keywork never replaces a good headjoint: how a flute sounds depends first of all on the headjoint. You can read more in headjoint cut and how it shapes tone and response. For used purchases, buying a used flute: what to check is worth a look as well.

Price range and surcharges in the United States

Surcharges are easiest to read from model pairs. All figures are rough guides from the new market (Oct. 2026).

• Open instead of closed holes: Between two otherwise similar intermediate flutes with a sterling silver headjoint, offset G and C foot, the open-hole version cost roughly $180 (sale pricing) to $240 (list pricing) more at one large retailer.
• Split-E: Where offered as an option, about $150 on one step-up model.
• B foot: Pricing varies by model and shop, so get quotes for both versions.
• Plugs: A set of five silicone plugs costs about $5; premium sets cost more.
• Offset or inline G: no across-the-board surcharge; the price depends on the model.

A new student flute generally costs somewhere around $700 to $1,300, and intermediate flutes with a sterling silver headjoint start in the area of $1,800 to $2,000 and go well beyond. Fully sterling silver pre-professional flutes start around $4,250 and professional all-silver flutes begin around $12,000 (all as rough guides). How much a B foot adds on the used market cannot be stated reliably; figures vary widely.

Maintenance costs

Keywork also shapes upkeep. Closed-hole flutes are a little simpler to repad and regulate, and so generally a little cheaper to service than open-hole ones. One shop charges about $200 for a clean, oil and adjust (COA) on a closed-hole student or intermediate flute and about $300 on an open-hole one; the same shop's overhaul runs about $400 for a closed-hole student flute and about $900 for an open-hole intermediate one. Elsewhere the numbers are much higher: a COA ranges from roughly $160 to $850 and a full repad from about $400 to $2,950 depending on shop, region and flute (Oct. 2026). Hourly rates for extra work run from roughly $50 to $225. Since these ranges are so wide, get a quote.

Care and hygiene of the keywork

The keywork is the most delicate part of the flute. Rods, springs, corks and felts do not tolerate moisture, skin oils or dust.

After every session

• Dry the inside of the flute with a suitable swab. Moisture promotes odor, mold and pad damage.
• Wipe the outside with a soft, absorbent cloth. This matters especially on open-hole keys, where fingerprints and skin oils collect.
• Never leave the cleaning cloth in the case, because it keeps the moisture in.

Regularly

• Remove dust and lint between keys and posts with a dry, soft brush, without bending any keys.
• You can dry sticky pads by sliding pad paper (or thin blotting paper) between pad and tone hole, pressing the key down gently and pulling the paper out. Dragging or soaking harms the pad skin.
• Treat tarnished silver with a dedicated silver polishing cloth, on the outside only and only where bare metal is visible. Polish must not get into the mechanism or dry on the flute. Skip chemical dips.
• Only clean what you can see. Paper, felt, leather and foam sit inside the mechanism, and they can come loose if you poke too hard.
• Store the flute in a dry case, away from radiators and windowsills.

What you should not do yourself

• Turning screws: one screw often affects more than one spot. The same goes for springs and rods.
• Gluing down loose pads: height and angle have to be exact, or the flute stays leaky.
• Bending keys back: it usually points to more damage.
• Oiling when you do not know exactly where and how much. Too much oil attracts dust and smears pads.

When it is time for the shop

A yearly check that cleans, oils and adjusts is worth it. It covers cleaning the mechanism, oiling pivots, checking springs, pads, corks and felts, setting key heights and a leak test. Daily players may go sooner. Warning signs are sticky or sluggish keys, trouble producing clean notes, a fuzzy tone, buzzing or hissing, loose screws and a misaligned mechanism. Catching these early avoids bigger repair bills.

Myths, checked

• "Open holes sound better." No proof exists. They allow other techniques and are mostly found on better-built flutes.
• "Inline G is more professional." No. The position is pure ergonomics, and both systems are acoustically identical.
• "A B foot is better, or a must for professionals." No. It changes the sound slightly, at the price of more weight and resistance.
• "Without a split-E I cannot reach high E." You can, with technique and practice. The mechanism makes it easier but replaces nothing.
• "Plugs throw the flute out of tune." Tight, flat plugs practically do not change intonation or tone according to the tests available.
• "A beginner needs open holes to learn properly." Not necessarily. With plugs and good teaching, the transition can come later.

Common buying mistakes

• Buying an open-hole flute for a beginner without plugs included or on hand.
• Choosing the B foot simply because it offers "more," and underestimating the extra weight for small hands.
• Assuming a split-E mechanism or gizmo can be added later. It is not that simple.
• Picking the configuration from a spec sheet alone, without having held the flute.
• Underestimating the age of the pads on a used flute: open-hole and plateau flutes alike need new pads after many years, which is one of the biggest cost items.

Quick checklist

1. Child or beginner: closed holes, offset G, C foot, preferably with a split-E mechanism.
2. You want open holes later: choose a model with plugs and remove them gradually.
3. Small hands: offset G; try inline before deciding.
4. B foot only if you need the low B or like the darker tone.
5. Try every variant in your hands before buying; every flute sounds a little different.
6. Dry it after playing, and have it checked once a year.