Dycem Black Hole Rockstop for Cello or Double Bass

Made by a company that specializes in non-slip rubber products, the Black Hole Cello Stop is a simple and effective means of holding the cello in place - the smoother and harder the floor, the better it works. Just place the Black Hole in position and let the unique non-slip properties do the rest. No messing around with strings or belt straps around the chair legs!! Easily carried in the pocket or in the case.