Marcinkiewicz 12 Mouthpiece for Trombone KS, Mouthpiece for Tenor Trombone, Small shank, Outer diameter: 38.10 mm, Inner diameter: 25.10 mm, Cup depth: 22.58 mm, Bore: 5.94 mm, Total length: 80.52 mm, Colour: Silver-plated, Comparable to Bach 12C
