The Hamskea Primer Arrow Rest features sealed stainless-steel ball bearings, zero tolerance technology, lightweight aluminum design, quality CNC machined components, and cord clamp. Hamskeaa; (TM)s latest activation cord dampening technology and patent pending Rebound Dampener are also included for improved performance. The Rebound Dampener helps to mitigate the shock that is transferred from the limb to the rest during shot and prevents wear. The Rebound Dampener acts as a shock absorber to eliminate launcher flutter, prevent cord stretch, and dampen the limb shock, extending the life of the rest. The Primer Arrow Rest is the lightest model in the Hamskea lineup, weighing only 3.6 ounces.