This product is made of high- materials, safe and durable, with texture.Very effective for sound attenuation, easy to install and use the trombone instrument silently.With this mute, you can on practicing the trombone without disturbing others.Fine workmanship, small size and easy to carry. A good helper for trumpet lovers.This useful trombone accessory can help you play a more beautiful melody.Made of premium material, flexible and durable to use. It is easy to use and operate. Will not scratch your trombone. It will in dampening trombone practice volume without affecting the tone.Colour:blackMaterial:ABSPackage Contents:4 x Only the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.