Limbsaver by SVL (Sims Vibration Laboratory)Delivers the quietest shot on any bow while maximizing the reduction of shock and vibration. Developed with a proprietary NAVCOM material using Sims Vibration Laboratory patented Decay Time Modification system. The system is similar to touching an active tuning fork with your finger which has a damping effect and tends to cancel the energy out. Simply add the LimbSaver Super Quad to your bow to ensure a smoother quieter more accurate shot with every draw. Fits 95% of all standard and wide split limb compound bows and crossbows. No hardware required. 2 pack.