ESS Crossbow Replacemnt Lens - Hi-Def Copper Crossbow replacement lenses are compatible with both Crossbow Tri-Tech Fit and Crossbow Suppressor frames. Advanced ClearZone FlowCoat lens treatments eliminate fog inside and prevent scratches outside. 2.4mm Interchangeable Lenses U.S. Mil Spec and ANSI Z87.1 Compliant Includes Gift Box