Martin Schippers Signature Series Bass Trombone MouthpieceHandcrafted trombone mouthpiece in silver plate. Designed and manufactured in a collaboration with The Brass Ark and artist Martin Schippers, trombone and bass trombone of the Royal Concertgebouw Orchestra. The MS B Bass trombone mouthpiece features a 27. 65mm rim, a Mr. Bass style cup and a large shank. The MS B is a two piece screw rim mouthpiece. More About Martin Schippers Martin Schippers began studying the tenor tuba with his grandfather at the