If you are looking for Trumpet Cornet Piston Spring, you should take at this item. This Trumpet Spring is made of solid material, which enjoys strong durability. It can greatly meet your practical requirement, can be used for musical instrument repair. Features -Color:Assorted Color -Material:Stainless steel, felt, plastic, wood -Size:4.00X0.80X0.80cm/1.57X0.31X0.31in -The versatile design of these repair components allows for easy replacement of wornout buttons on musical instruments. -This set includes felt, spring, and cork components, which are essential for reliable and consistent results. -By using these components, musicians can achieve a more polished and professional sound in band, orchestra, and solo settings. -These instrument repair parts are suitable for maintaining and upgrading a variety of brass instruments, including trumpets and trombones. -An essential tool for any musician looking to keep their musical instrument in good condition. Package list: 30 x Felt Washers 2 Key Corks 3 x Horn Valve Springs 3 x Support Reeds