The VME511 Endpin Stopper is very popular because it can be used on any surface. On one end of the strap is a loop for a chair leg, ensuring the stopper will not slide away. On the other, a small cup holds the endpin of the cello, preventing damage to the floor and keeping the cello from sliding. The strap is adjustable, so once it is set to your desired length you can always count on it being in the optimal playing position every time. Can be used with or without a spike protector.