This is a trombone accessory, specially designed for trombone keys. Suitable for many types and brands of trombone on the market. It can meet your long-term needs, with excellent grade, wear resistance. Features -Color:Silver -Material:Metal, Plastic -Size(1):6.50X2.20X1.20cm/2.55X0.86X0.47in -Size(2):2.50X1.20X1.00cm/0.98X0.47X0.39in - The design is simple, easy to use, easy to clean and install or remove, and can be cleaned regularly. - craftsmanship, easy to replace, perfect replacement parts for trombone lovers. - Rugged and durable, it can be used for a long time without damage. A good tool for musical instruments. - Protect the music instrument effectively, keeping your trombone always in a good condition. - Suitable for most trombone, with a wide range of applications, which can meet your various needs. Package list: 1 x Valve 1 x Spring