Bonmusica shoulder rests have a unique design that allows for stability, flexibility and comfort. Bonmusica shoulder rests have a unique design that allows for stability, flexibility and comfort. They have foam padding along a metal base with a ‘hook’ that rests over your shoulder to stop the instrument from sliding down. This hook can be manipulated to fit the exact contour of the players shoulder so that it fits perfectly. The Bonmusica is adjustable in height, sideways slant, length over the shoulder and is available in all sizes.