This 2cm wide heavy duty woven strap with Round-ring can secure the molded cup with non- directly to almost any chair leg. It's adjustable from 16inch to 28inch, which can accommodate most players. It will protect your floor from scratches and make your cello doesn't during a practice or performance. High quality for durable and long-lasting use. Adjustable from 40cm to 70cm to accommodate most players. Folds compactly for storage. Hold cello/double bass stably. Help prevent cello from slipping or damaging the floor. Size: . 30 * 5 * 0.5cm/ 12 * 2 * 0.2 inch (L*W*H). colour: black Material: Plastic+nylon Package Contents: 1* Cello Antiskid Device Only the above package content, other products are not included. Note: Light 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.