The Crossbones Riflescope from Leupold was designed specifically for crossbow hunting. Features the Quantum Optical System with lead-free glass and Multicoat 4 lens coatings. Also features a unique Crossbones Ballistic Reticle, matched with velocity/power selector on the scope. Lead-free glass lenses for superior optics. Generous eyebox for easy and flexible sighting. 1/4 MOA finger click adjustments for windage and elevation. Sealed and nitrogen purged for waterproof and fogproof use. Lightweight and durable aircraft-quality aluminum body.