Which has a bigger cup — Kelly 3C or Kelly 7C?

The Kelly 3C has a cup diameter of 17.02 mm / 0.6701 in compared to 16.51 mm / 0.6500 in on the Kelly 7C — a difference of 0.51 mm / 0.0201 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Kelly 3C and Kelly 7C?

The Kelly 3C has a very deep cup while the Kelly 7C has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Kelly 3C vs Kelly 7C

Name: Kelly 7C
Brand: Kelly

The Kelly 3C has a wider cup diameter, the Kelly 3C features a deeper cup, the Kelly 3C has a larger throat opening.

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

Surface plating or treatment (e.g. silver plate, gold trim). Affects feel, durability, and appearance.

Mouthpiece A

Kelly 3C

• Cornet

General

Finish—

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📣High-volume projection — open throat for power

📋All-purpose mid-range

Mouthpiece B

Kelly 7C

• Cornet

General

Finish—

Best suited for

🎵All-round versatile — balanced cup for general playing

📋Beginner / intermediate

Which is better?

Both mouthpieces are categorized as "General" — the physical dimensions above will determine which suits your embouchure and playing style better.

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Kelly 3C vs Kelly 7C

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

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