Made of premium rubber material, it is flexible and durable to use. It is easy to use and operate. Will not scratch your violoncello and violoncello bridge. It will provide convenience in dampening violoncello practice volume without affecting the tone. Features -Color: Black. -Material: Rubber. -Size:3.50X3.50X1.30cm/1.38X1.38X0.51in -Made of rubber material, this cello mute is durable and practical enough to use. -It can effectively reduce the volume of practice and have a good sound reduction effect. -Share with your friends and family as this cello is wonderful and practical. -The violoncello with smooth surface make it safe for your precious violoncello and hands. -Featuring small and compact, it is convenient to store in a bag and easy to carry with you. Package list: 2 x violoncello silencers