Yibuy Black Violin Mute for 3/4-4/4 Violin Sliding Mute Round Rubber Mutes Set of 5 Fit for 4/4 and 3/4 size violin. This Round Rubber Mute for 3/4-4/4 Violin conforms to the shape and curvature of the bridge for better contact,good muting power and balanced sound.Installs in seconds and is easy to change. Conforms to the shape and curvature of the bridge. Made of rubber material