Brown Mahogany Wood piano desk knobs, set of 2, with screws included to attach them to the keyboard cover of your piano. Rubber buttons also included (screw goes through hole in knob, rubber button inserted into hole). Designed specifically for a piano, but can be used with other furniture as well. The knobs measure 3/4" in diameter, and 3/4" in height. Screw is 3/4" long