Feature: Length Adjustable, 2" wide heavy duty woven strap with large Round-ring secures the molded cup with non-slip sole directly to almost any chair leg Adjustable from 16" to 32" to accommodate most players. Folds compactly for storage. Hold cello/double bass stably. Helps prevent cello from slipping or damaging the floor. Protect your floor from scratches and make sure your cello doesn't slip during a practice or performance. Wooden Size:150mm x 61mm x 16mm Package included: 1 x Shoulder Rest.