Set of 4 clamps with openings of 110 mm, 145 mm, 180 mm, & 215 mm, for violin/viola, 60% lighter than brass clamps with clamping jaws which are flexible and fit to the contours of the instrument to reduce the risk of chipping the edges, silicon non-slip jaws hold the clamp securely (even when applied close to the upper or lower end of the instrument body.