GR Technologies 3M vs GR Technologies 66M
Both mouthpieces share similar core dimensions — the differences are in the details.
The width of the rim surface that contacts the lips. Wider rims improve endurance; narrower rims improve flexibility.
Mouthpiece A
GR Technologies 3M
• Trumpet
Rim width—
vs
Mouthpiece B
GR Technologies 66M
• 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.