Excalibur Crossbow Sound Deadening System Black. Works with all Excalibur hunting model crossbows. Includes an over molded rubberized stirrup Ex-Shox String Stars and R.A.V.S silencers. Specifications for Excalibur Crossbow Sound Deadening System: Manufacturer: Excalibur Crossbow Color: Black Package Contents: Excalibur Crossbow Sound Deadening System The Sound Deadening System dramatically reduces noise vibration and recoil in limbs string and stirrup. Works with all Excalibur hunting model crossbows. Includes an over molded rubberized stirrup Ex-Shox String Stars and R.A.V.S silencers.