A carefully selected Bach mouthpiece can help improve a player's embouchure, attack, tonguing, and endurance. Vincent Bach was a rare combination of artist and engineer. A mechanical genius and acclaimed trumpet soloist, his instruments and mouthpieces are used today in every major studio and orchestra in the world. Bach personally designed the tools and composed the plans that continue to set the high standards for making all Bach products today. Bach 12 Small Trombone Mouthpiece The Bach 12 Trombone Mouthpiece combines a solid, dark tone, excellent flexibility, great volume, and easy response, making it a great all-around small shank mouthpiece. Specifications Instrument: TromboneManufacturer Model: 35012Series: StandardPlating: SilverCup Diameter: 24.5mmCup Depth: MediumRim Shape: Medium WideBore: 5.85mmBackbore: #402Shank: Small