eBoot Rubber 4/4 Violin Practice Mute, Black Great for practicing and playing violin when you don't want to disturb your family or friend Easy to use, just put it on top of the bridge Compatible with 4/4 violin Material: Rubber Dimensions: approx. 2.1 (L) x 1 (W) x 0.5 (H) inch (5.3 x 2.5 x 1.3 cm)