The SENTRY XP-6 Extreme Scopecoat optics covers are designed to o?er maximum protection for all service-weapon optics. SENTRY Scopecoat safeguards your optics from dust, dirt, dings, scratches and moisture. Made from 6MM thick Neoprene a material commonly used in wetsuits, these riflescope covers conform to the shape of the riflescope upon which it is placed. The Neoprene/Nylon laminate composition assists in repelling moisture and condensation away from your optic, as well as, dirt and debris. This combination helps to protect your optics from the elements and damage when storing in your safe or transporting your weapons to and from the range. Features / Specifications:Elongated sides allow complete coverage for tall or tactical turrets. Available in sizes from 8.5" to 19.5" and Objective diameters from 40-60MM.6MM thick Neoprene for maximum protection and durability. Large: 12.5" Long x 42mm Diameter