Energetic Armament Flash Hiding End Cap 5.56mm Nitride Black. The caps fit both the VOX and ARX series silencers. Please note this cap does not include provision for the installation of a wipe. Specifications for Energetic Armament Flash Hiding End Cap: Manufacturer: Energetic Armament Color: Black Finish: Nitride Fabric/Material: Stainless Steel Weight: 0.91 oz Package Contents: Energetic Armament Flash Hiding End Cap Energetic Armament EA38: Flash Hiding End Cap 5.56mm Nitride Black