The String Stop. The difference between ours and others on the market is our SandTrap filled string stop rod. At the shot, the string hits the VibeKiller rubber end transfering energy and vibration into the string stop. The SandTrap technology shifts inside the stop rod eliminating the vibration before reaching the bow effectively killing it before you feel it in the bow riser. We offer a screw in rear mounting version, and we also offer custom bow model specific string stops to ensure a perfect fit. Handmade one at a time in the USA!