Schilke is the brand players switch to when they want more precision than Bach. The mouthpieces cost more, they're machined to tighter tolerances, and they offer more configuration options — multiple backbore variants, multiple rim contour choices — that Bach's standard line doesn't provide.
The Schilke numbering system also runs opposite to Bach, which causes endless confusion for players making their first cross-brand comparison. Get that sorted up front and the rest of the system makes sense.
This guide covers the full Schilke trumpet mouthpiece line, the complete four-part naming system decoded, the famous 14A4a explained in full, and an honest comparison to Bach and Yamaha.
Reynold Schilke and His Philosophy
Reynold Schilke was a principal trumpet player with the Chicago Symphony Orchestra and a meticulous craftsman who became obsessed with the physics of mouthpiece and instrument design. He started making mouthpieces and instruments in Chicago in the 1950s with a philosophy that contrasted sharply with Bach's: where Bach built a broad product line at accessible prices, Schilke focused on precision engineering at higher price points, targeting serious students and professionals.
Schilke documented his design choices more thoroughly than any other major manufacturer — the backbore system, the rim contour system, the cup volume categories. That documentation is part of why Schilke mouthpieces are trusted by players who want to make informed, specific decisions rather than general choices.
Schilke Music Products continues to manufacture in the United States. Current production Schilke mouthpieces maintain the brand's reputation for tight tolerances and consistency.
The Schilke Naming System — The Full Four-Part Code
The most important thing to know before anything else: Schilke numbers run opposite to Bach. Lower Schilke number = smaller mouthpiece.
A player moving from Bach 3C who sees a Schilke 3 and assumes it's similar is in for a surprise — a Schilke 3 is dramatically smaller than a Bach 3.
The full Schilke model code has four parts. Most catalog models show only some of them because the rest are assumed standard.
14 A 4 a
│ │ │ │
│ │ │ └── Backbore (a=tight, b=semi-tight, c=standard, d=medium large)
│ │ └─────── Rim contour (1=roundest, 5=flattest)
│ └──────────── Cup volume (A=small/shallow, B=med-small, C=standard, D=med-large, E=large)
└───────────────── Cup diameter (lower = smaller)
When a Schilke model shows only a number — like "Schilke 14" — all other parameters are standard: C cup volume, 3 rim contour, c backbore. The full code is 14C3c, abbreviated to 14.
Cup diameter scale
| Schilke number | Rim diameter (approx.) | Bach equivalent |
|---|---|---|
| 6 | ~14.30mm | Smaller than any standard Bach |
| 7 | ~14.60mm | Smaller than Bach 12 |
| 10 | ~15.40mm | Bach 12 area |
| 11 | ~16.20mm | Bach 7 |
| 12 | ~16.30mm | Between Bach 7 and 5 |
| 13 | ~16.48mm | Bach 5 |
| 14 | ~16.76mm | Bach 3 area |
| 15 | ~16.84mm | Between Bach 3 and 1.5 |
| 16 | ~16.84mm | Bach 1.5 |
| 17 | ~17.00mm | Bach 1 |
| 18 | ~17.15mm | Larger than Bach 1 |
Cup volume letters
Schilke measures cup volume — a combination of depth and shape — rather than depth alone.
| Letter | Cup volume | Roughly equivalent Bach cup letter |
|---|---|---|
| A | Small / shallow | Between Bach D and E |
| B | Medium-small | Roughly Bach D |
| C | Standard | Roughly Bach C |
| D | Medium-large | Roughly Bach B |
| E | Large / deep | Roughly Bach A |
Rim contour numbers
| Number | Rim shape | Feel |
|---|---|---|
| 1 | Roundest | Softest, most comfortable for long sessions |
| 2 | Semi-round | Comfortable with slightly more definition |
| 3 | Standard | The default — works for most players |
| 4 | Semi-flat | More precise placement feel |
| 5 | Flattest | Maximum precision, less comfortable for very long sessions |
Backbore letters — the most complete system in the industry
Schilke documents their backbore options more thoroughly than any other major manufacturer:
| Letter | Backbore type | Effect on playing |
|---|---|---|
| a | Tight | More brilliance, better upper register control, more resistance |
| b | Semi-tight | Between tight and standard |
| c | Standard | Balanced — the default |
| d | Medium large | Darker, more volume, less resistance |
| x | Large | For piccolo trumpet specifically |
| z | Extra-tight | Maximum resistance and focus — specialist use |
The Complete Schilke Standard Trumpet Line
Standard models (C cup, 3 rim, c backbore — abbreviated to just the number)
Schilke 6
Very small rim (~14.30mm). Specialist high-note use. Very significant tone and low register trade-offs. Not for general playing.
Schilke 11
Rim: ~16.20mm | Cup: Standard (C) | Rim: Standard (3) | Backbore: Standard (c)
The Bach 7C equivalent in Schilke. Medium-small rim, standard cup. The starting point for players making the switch from Bach 7C territory.
Schilke 12
Rim: ~16.30mm | Cup: Standard
Between 11 and 13 — a step up from the 7C size range without jumping all the way to 3C territory.
Schilke 13C
Rim: ~16.48mm | Cup: Standard
Roughly Bach 5C equivalent. Medium rim, standard cup. The mid-range workhorse of the Schilke line.
Schilke 14
Rim: ~16.76mm | Cup: Standard
The Bach 3C equivalent — the most widely used Schilke model. Medium-large rim, standard cup, all other parameters standard. The go-to for players switching from Bach 3C who want more precision and consistency.
Schilke 15
Rim: ~16.84mm | Cup: Standard
Between Bach 3C and 1.5C territory. For players who find the 14 slightly small but the 16 too large.
Schilke 16
Rim: ~16.84mm | Cup: Standard
Roughly Bach 1.5C equivalent. The orchestral standard in the Schilke line. Used by professional orchestral players as a direct alternative to the Bach 1.5C.
Schilke 17
Rim: ~17.00mm | Cup: Standard
Roughly Bach 1C equivalent. Large orchestral setup.
Schilke 18
Rim: ~17.15mm | Cup: Standard
Larger than the Bach 1C. Very large orchestral specialist.
Key variants worth knowing
Schilke 14C
The standard 14 — this is how most players refer to it. Same as "Schilke 14."
Schilke 14B
Rim: ~16.76mm | Cup: Medium-small (B)
Slightly shallower than standard. Brighter than 14C. Popular with jazz players who want the 3C-size rim but a slightly more forward, commercial sound.
Schilke 14D
Rim: ~16.76mm | Cup: Medium-large (D)
Slightly deeper than standard. Warmer tone. Good for players who want more warmth from the 3C-equivalent rim.
Schilke 16C
The orchestral standard. Full name 16C3c — abbreviated to 16 or 16C.
Schilke 16B
Orchestral with slightly shallower cup — warmer than standard but not as deep as 16D.
The Schilke 14A4a — Fully Decoded
The 14A4a is the most famous lead trumpet mouthpiece in the world. Here is every character in the model name explained:
- 14 — Medium-large cup diameter (~16.76mm) — the Bach 3C rim size area. Provides enough rim diameter for tone and resonance in the upper register.
- A — Small cup volume (shallow) — reduces the air column requirement for high notes, improving endurance in the upper register. The primary reason for the mouthpiece's effectiveness for lead playing.
- 4 — Semi-flat rim contour — provides a clear, precise physical reference point for embouchure placement. Helps consistency in the upper register, particularly for landing high notes cleanly.
- a — Tight backbore — supports the upper register, adds brightness, provides controlled resistance that helps the lips slot high notes reliably.
Combined: everything in the mouthpiece is optimized for upper register efficiency, brightness, and consistency. The medium-large rim provides enough resonance to sound musical in a big band context. The shallow cup, tight backbore, and semi-flat rim work together to make the upper register as efficient and consistent as possible.
This mouthpiece requires trade-offs. The thin tone in the low and middle registers, the reduced flexibility, and the brightness that works in a lead context sounds wrong in an orchestral or ballad context. It is a specialist tool, not an all-purpose mouthpiece.
Who Should Consider Schilke
Players who want more consistency than Bach provides
The most common reason to switch to Schilke. Players who've found that two Bach 3C mouthpieces of the same model feel slightly different, or who want to buy a precise backup of their primary mouthpiece, often switch to Schilke for the tighter manufacturing tolerances.
Players who need specific backbore customization
Schilke's documented backbore system (a through z) lets players dial in resistance with a precision that Bach's standard line doesn't offer. Players with specific resistance needs — particularly lead players who want the tight-a backbore or orchestral players exploring the d/medium-large option — benefit from Schilke's more explicit system.
Players who want a semi-flat rim
The rim contour option 4 (semi-flat) isn't available in Bach's standard line. Players who've tried the 14A4a and prefer the semi-flat rim's precise placement feel can get that same rim contour across Schilke's range of cup sizes.
Lead players
The 14A4a is the lead standard for a reason. For players who play lead trumpet regularly, it's worth trying even if you're not sure about switching the rest of your setup.
Schilke vs. Bach — The Practical Differences
| Factor | Bach | Schilke |
|---|---|---|
| Price | $30–$40 standard | $60–$80 standard |
| Manufacturing consistency | Good — some variation between pieces | Excellent — very tight tolerances |
| Availability | Everywhere | Most music stores, online |
| Backbore options | Limited | Full a-z documented system |
| Rim contour options | Standard only | 1–5 scale |
| Naming system | Lower number = larger | Lower number = smaller (opposite) |
| Sweet spot | All-around value and availability | Precision and customization |
Bottom line: If you're happy with Bach and budget is a consideration, Bach is excellent. If you want more precision, more configuration options, or you've specifically identified that Bach's standard contour or backbore isn't quite right for you — Schilke is the logical next step.
Schilke vs. Yamaha
Both brands offer better manufacturing consistency than Bach at comparable or slightly higher price points. Schilke edges Yamaha in customization options (the backbore and rim contour variants). Yamaha's naming system is entirely different from both Bach and Schilke — see the Cross-Brand Comparison Guide for the full breakdown.
What to Do Next
Find Schilke equivalents for your current Bach mouthpiece:
→ Cross-Brand Comparator
Decode any Schilke model name:
→ Naming Decoder
Read the full sizing system explanation:
→ Trumpet Mouthpiece Sizes and Numbers Explained
Compare to the Bach brand guide:
→ Vincent Bach Complete Brand Guide
Related articles: Cross-Brand Comparison Guide · Vincent Bach Brand Guide · Warburton Mouthpiece Guide · Trumpet Mouthpiece Sizes and Numbers Explained