Which has a bigger cup — GR Technologies G66** or Schilke 13A4a?

Both mouthpieces have virtually identical cup diameters at 16.76 mm / 0.6598 in.

How does cup depth compare between GR Technologies G66** and Schilke 13A4a?

The GR Technologies G66** has a medium cup while the Schilke 13A4a has a shallow cup. Deeper cups favor a darker, richer sound; shallower cups provide more brightness and easier upper register.

GR Technologies G66** vs Schilke 13A4a

Name: Schilke 13A4a
Brand: Schilke

the GR Technologies G66** features a deeper cup.

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

The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.

Mouthpiece A

GR Technologies G66**

• Trumpet

Rim width—

Mouthpiece B

Schilke 13A4a

• Trumpet

Rim width—

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.