Constructed from strong/durable aerospace lightweight aluminum alloy, anodized, matte black finish. Fiber optic provides brighter ambient and reticle lighting during the day, and the illuminated aiming point will automatically adjust the brightness based on available light， Wind resistance and height can be adjusted. The red fiber-optic sight is fitted with an anti-reflection cover on the front to prevent the hidden location from being discovered. Shockproof, fog-proof, and weatherproof. Fits any 20mm Picatinny standard rail. Magnification: 3.5 times， Objective Diameter: 35mm.