ATN uses the purest grades of heavy glass and computer aided optical designs. All lenses are multi-element, high aperture and multi coated. Night vision devices utilize only the best hand selected Image Intensifier Tubes. Material range from titanium, aircraft quality aluminum to hi-impact plastic. All unit feature O-rings, nitrogen purging and hard exterior coating. Mounting Rings for ATN Day Vision Scope (ATN-533), rings only, not a scope or Night vision unt. All ATN units come with carrying cases, batteries, users manuals and instructional video. For all warranty claims, please contact ATN Warranty center directly at 1-800-910-2862 for repair or replacement. Non Returnable to Cheaper Than Dirt!