Trijicon MRO Slip on Cover Clear w/Clear Lens Black. These Red Dot Sight Accessories have integral lens covers and a protective armor body that can't fall off or get lost. The low-profile design allows covers to be quickly operated with one hand. The covers nest together so they don't flop under recoil. These accessories are receptive to most spray paints and hydro dip processes. Specifications for Trijicon MRO Slip on Cover Clear w/Clear Lens: Manufacturer: Trijicon Condition: New Features of Trijicon MRO Slip-On Cover: Keeps optic body and lenses protected in extreme harsh environments One-handed operation Durable thermoplastic polyurethane material resists solvents oils and UV exposure Package Contents: Trijicon MRO Slip on Cover Clear w/Clear Lens Trijicon AC31021: MRO Slip on Cover Clear w/Clear Lens Black