Increase your arrow speeds and make your bow deadly silent with the Super Slipjax Bow String Silencers by Bowjax. These string silencers are extremely effective at vibration and noise dampening and will virtually eliminate string oscillation at the shot. With their compact, rubber design, these silencers are both lightweight and durable and will last even on today's faster compound bows. A bow press may be required to install these string silencers, because they are inserted between the fibers of the bow string. Can increase bow speeds by 1 to 3 fps. Come in packs of four.