This Wittner ISNY Model 282 3/4-4/4 Violin and Viola Shoulder Rest is designed to fit and be used with all other chinrest brands other than Wittner. It features a free-floating design, no muting effects, central mounting, universally adjustable, all materials are anti-allergic, super-light construction, fits absolutely ergonomically, and stays always in the same position after being mounted. It comes with everything needed to mount it onto your 3/4-4/4 Violin or Viola equipped with a non-Wittner brand chinrest.