Which has a bigger cup — Kelly 51D-EU-SS or Schilke 38D?

The Kelly 51D-EU-SS has a cup diameter of 25.40 mm / 1.0000 in compared to 19.73 mm / 0.7768 in on the Schilke 38D — a difference of 5.67 mm / 0.2232 in. A wider cup generally produces a fuller, darker tone but requires more air support.

How does cup depth compare between Kelly 51D-EU-SS and Schilke 38D?

The Kelly 51D-EU-SS has a — cup while the Schilke 38D has a medium cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

Kelly 51D-EU-SS vs Schilke 38D

Name: Schilke 38D
Brand: Schilke

The Kelly 51D-EU-SS has a wider cup diameter, the Kelly 51D-EU-SS features a deeper cup.

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

Kelly 51D-EU-SS

• Baritone / Euphonium

Professional

Material316 Surgical Stainless Steel

Best suited for

🎻Orchestral playing — large cup for full, dark tone

📋Professional euphonium

Mouthpiece B

Schilke 38D

• Baritone / Euphonium

Material—

Material

The Kelly 51D-EU-SS is described as 316 Surgical Stainless Steel, and the Schilke 38D as unspecified. 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.

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Kelly 51D-EU-SS vs Schilke 38D

Material

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