Waterproof, fogproof, nitrogen gas-filled. Shock resistant. Includes Weaver style rings. Duplex Reticle. Generous 4" eye relief. Fully coated lenses provide maximum brightness, clarity and contrast. Rubber eye guard. Fingertip windage and elevation adjustment under screw down caps. Durable leaf spring for windage and elevation adjustments. One piece tube made of aircraft quality aluminum. Durable, scratch resistant, non reflective matte finish. Compact and lightweight.