Schilke Standard Large Shank Trombone Mouthpiece in Silver 51B Silver The Schilke line of trombone mouthpieces offers a very comprehensive line of equipment to meet any playing needs by trombone players, baritone horn players and euphonium players Great care has been taken to provide as many functional products as possible All models in this listing are silver plated large shank mouthpieces The Schilke Trombone Bass Trombone Mouthpieces Identification Levels Numbers 40 through 53 for tenor trombone baritone and euphonium The numbers 57 through 60 are for the Bass tromboneNumbering System When a Schilke mouthpiece has a standard backbore, rim and cup, only the cup diameter (first number) is shown on the mouthpiece