Specification Packing: 3 pcs Material: Rubber Colour: Black Size: 27x17x8mm/1.06x0.67x0.31inch Robust, highly durable and environmentally safe with a long service life. Soft and environmentally friendly, comfortable and durable to use, excellent mute effect, does not affect the volume, maintains the original sound Easy to install. Good replacement parts for damaged or old parts. Perfect for practicing the violin when you don't want to disturb others, especially late at night Compatible with all violins for quiet practice.