Which has a bigger cup — Conn Precision 3 or Kelly 7C-UK?

The Kelly 7C-UK has a cup diameter of 16.51 mm / 0.6500 in compared to 16.41 mm / 0.6461 in on the Conn Precision 3 — a difference of 0.10 mm / 0.0039 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Conn Precision 3 and Kelly 7C-UK?

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

Conn Precision 3 vs Kelly 7C-UK

Name: Kelly 7C-UK
Brand: Kelly

The Kelly 7C-UK has a wider cup diameter.

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

Conn Precision 3

• Cornet

General

Finish—

Best suited for

🎵All-round versatile — balanced cup for general playing

📋All-around use; most popular model

🎶Bright quality of tone in all registers; good all-around

Mouthpiece B

Kelly 7C-UK

• Cornet

General

Finish—

Best suited for

🎵All-round versatile — balanced cup for general playing

📋Comfortable music-industry standard

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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Conn Precision 3 vs Kelly 7C-UK

Playing Characteristics

What Do These Model Names Mean?

What Changes If You Switch?

Which is better?

Compare Conn Precision 3 with others

Compare Kelly 7C-UK with others

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