The Ultra I String Silencer is the perfect addition to your bow if you are looking to completely silence your archery equipment. These rubber silencers easily install on the outside of the string and greatly reduce string oscillations by up to 90% This string dampener does not require a bow press for installation. Simply slide the silencer over your string through the slot in the side and secure with the included zip ties or your own serving material to instantly kill bow vibration. For best results these dampeners should be installed 3 to 4 inches from the cams. This will maximize the dampening and increase arrow speeds by 1 to 3 feet per second. Perfect for your bow string or cable.