Made from Rubber Softness and environmental friendly No noise when dropped, and easy washable When you do not use the instrument, cover it and prevent the dust falling on the mouth, protects mouthpiece rail It fits for most part of mouthpieces(Clarinet, Saxophone,Tenor Saxophone,Saxophone accent, Saxophone treble) Preserves reed moisture; Durable and easy to carry, small enough to fit; Color: black Material: Rubber Total size: 46 x 30 x 17 mm(LxWxH) Inner width: 20 mm and 25 mm Inner height: 12 mm Package Content: 4 x Flute Mouthpiece Cap Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.