● Violin Practice Mute OTTO MUSICA ARTINO PM-01 This is a set of three of the above violin practice mutes. It is a composite material type that covers metal with a plastic (hard rubber) cover. It provides a high degree of sound reduction and is an excellent practice mute that also considers the safety of the instrument. I purchased these as spares, but they are so durable that I haven't needed to replace them. They have been stored at home unused, so they are new and unused. Shipping will be on days other than Tuesdays and Thursdays.