Ultra USA: Black Rubber Mute for 4/4 Violin , for very quiet practice VWWS USA Go to amazon.com Related posts Top 10 recommendation practice mute 2019 FeatureBlack Rubber Mute for very quiet practice51116 101274 Ultra USASuitable for 4/4violinA product of USA DescriptionBlack Rubber Mute, Ultra USA for use on 4/4 violin, Very quiet practice, Fits well on a properly fitted Bridge