The Artino Rubber Coated Heavy Metal Practice Mute for Violin & Viola is a traditional heavy metal mute with a durable rubber coating. This rubber coating is designed to protect your bridge and instrument. As with other heavy metal mutes, it allows for practice without disturbing others and with the rubber coating it reduces the sound level to a minimum while maintaining sound quality. It takes seconds to fit it on the bridge and is one of the best practice mutes we've found. This model is for violins and violas.