The Artino SP-4W Sound Anchor Endpin Stopper is much more than an endpin rest. It also functions as a sound enhancer because of the round walnut/rosewood hollow box with the unique resonance hole. The adjustable chair strap helps on any slippery floor while the slip proof pad keeps it in place and protects the floor. The easy to find dimple holds the endpin in place. This stylish, functional, high quality piece of equipment is a tremendous value.