The Bushnell Trophy XLT 10x 42mm Binoculars (Special Bone Collector Edition) offer world-class optics and superior durability. With light transmission, clarity and ruggedness as top priorities, we built the ultimate hunting binoculars. These powerhouse binoculars have fully multi-coated lead-free optics and BaK-4 prisms that work in tandem to deliver ultra-bright, razor-sharp images through the most critical periods of game movement. The tough, streamlined Dura-Grip rubber-armored housing is O-ring sealed and nitrogen purged for 100% waterproof/fog proof dependability.