TruGlo's Crossbow Compact Scope is waterproof/fogproof, shock-resistant, and has a special range finding and trajectory compensating reticle. It features a generous 4" eye relief, fully-coated lenses provide maximum brightness, clarity and contrast. This model has a rubber eye-guard, durable leaf spring for windage and elevation adjustments, one-piece tube made of aircraft quality aluminum with a durable, scratch-resistant, non-reflective matte black finish. Included are Weaver style rings. Features: Generous 4 inches eye relief Fully-coated lenses provide maximum brightness, clarity, and contrast Durable, scratch-resistant, non-reflective matte finish Nitrogen gas-filled