Waterproof / fog-proof / nitrogen gas-filled. Model TG8504BR includes rings for .22 and air rifles. Model TG8504BD/CD includes Weaver-style rings. * Diamond reticle is specially designed for shotgun hunting and is perfect for turkey and deer. * 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. Lifetime Limited Warranty.