Styrka S5 Series 1.75-5x32 Riflescope, Black (ST-93010) All lens surfaces are coated multiple times utilizing our proprietary SXL anti-reflective coatings for maximum brightness and optimal color, sharpness and image contrast Blackened lens edges block stray light for reduced reflection and glare, enhancing image contrast Rugged erector tube system is precision machined from premium brass to maintain critical accuracy and point-of-impact in extreme hunting situations 1" 6061-T6 aircraft-grade aluminum one-piece tube construction that is strong and durable Waterproof and nitrogen purged to prevent internal fogging