Tango Down iO-001 Optic Cover for Aimpoint T-1/H-1/R-1 Optic Sights Scopes Keeps optic body and lenses protected in extreme, harsh environments. One handed operation, covers nest together to prevent snags. Durable thermoplastic polyurethane material resists solvents, oils and UV exposure OA Length: 2.75 Width: 1.60 Weight: 0.6 oz.