Richard Marshall Signature Line. An ‘A’ cup version of the RM1 cornet mouthpiece, with a very slightly shallower cup and modified backbore. This mouthpiece improves the higher register response and is generally easier to play than the RM1.
Alliance RM1A Cornet SP mouthpiece
Cup Diameter: 17 mm
Rim: 5 mm
Bore: 4.5 mm
Comparison: Wick 2B.