Features: 1.Made of high quality material, is solid and durable in long term use. 2.With sliver plating surface, glossy, good-looking and stylish. 3.Compatible with most standard alto trombone. 4.Whether you are an alto trombone enthusiast or beginner, it is really an ideal accessory or gift for you or friends. 5.Precise design feature allows good tone quality and bringing you better playing performance.specification: Made of high quality material, is solid and durable in long term use. With sliver plating surface, glossy, good-looking and stylish. Compatible with most standard alto trombone. Whether you are an alto trombone enthusiast or beginner, it is really an ideal accessory or gift for you or friends. Precise design feature allows good tone quality and bringing you better playing performance. : Material: Brass Body+Silver Plating Color: Silver Type: 12C Total Length: Approx. 8cm/3.14inch Shank Lengh: Approx. 3.8cm/1.49inch Mouthpiece Outer Dia: Approx. 3.8cm/1.49inch Connector Inner Dia: Approx. 0.9cm/0.35inch Connector Outer Dia: Approx. 1.1cm/0.43inch Weight: Approx. 167g Packing List: 1 x Alto Trombone Mouthpiece