The Yamaha Rim Saver protects the rim two ways: first, it comes with button head Allen key screws that allow a new or used rim to be protected from mallet hits and clicks. Rugged construction with contoured strike zone provides the perfect sound without damaging the mallet or the rim. Second, a screw and nut are provided in the case where a rim has fractured or broken—a great emergency repair to hold you over until a new replacement rim arrive. The small Rim Saver fits marching drums from 14" to 18". The large Rim Saver fits marching drums from 20" to 32".