Vincent Bach 6 1/2 AL Trombone Mouthpiece, Large Bore, Used Made of brass, offering high durability and sound quality. - Model: Vincent Bach 6 1/2 AL - Material: Brass (Silver Plated) - Application: Trombone Mouthpiece Bach is a leading American musical instrument manufacturer. Bach has a long history, and it's a brand that anyone who plays brass instruments has heard of at least once. This is a recommended model, especially for those who are purchasing a trombone mouthpiece for the first time. There is no damage to the plating, but there is some wear and tear from use. Thank you for viewing.