This exciting accessory uses a combination of modern vibration reduction technology and common sense thinking to produce the most durable and effective shock and sound reduction possible. The new "S5" string shock and sound suppression system attaches easily and quickly to mounting holes in the riser of all 2004 or newer Excalibur Crossbows and will work either in conjuction with Excalibur's disspator bar system or on its own to quiet shot noise and reduce vibration