Which has a bigger cup — Bach 1½C or Kelly 7C?

The Bach 1½C has a cup diameter of 17.00 mm / 0.6693 in compared to 16.51 mm / 0.6500 in on the Kelly 7C — a difference of 0.49 mm / 0.0193 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Bach 1½C and Kelly 7C?

Both mouthpieces share a medium cup depth, so the sound character from depth alone will be very similar.

Bach 1½C vs Kelly 7C

Name: Kelly 7C
Brand: Kelly

The Bach 1½C has a wider cup diameter.

Overall Comparison Cup Diameter Cup Depth Rim Width Throat Diameter Backbore Finish Material

Base metal or construction (e.g. brass, stainless steel, plastic). Influences weight, response, and tone color.

Mouthpiece A

Bach 1½C

• Cornet

Material—

Mouthpiece B

Kelly 7C

• Cornet

General

MaterialLexan polycarbonate

Best suited for

🎵All-round versatile — balanced cup for general playing

📋Beginner / intermediate

Material

The Bach 1½C is described as unspecified, and the Kelly 7C as Lexan polycarbonate. Material affects mass, warmth, and how quickly the piece responds.

Which is better?

Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.

Open in interactive tool + Add third mouthpiece Bach 1½C details Kelly 7C details Bach 1½C equivalents Kelly 7C equivalents

Bach 1½C vs Kelly 7C

Material

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

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