This Heavy Metal Practice Mute For Violin-Viola-Cello has maximum muting power and provides the clearest tone of all practice mutes. It's ideal for practicing in apartments late at night or when you don't want to disturb your friends or family. Made of best quality nickel-plated machine brass with a shiny polished gold or nickel colored surface. If you need it quiet, this is the best it gets. Cello available only in nickel finish.