The Vortex Optics Crossfire HD Binocular are full-size roof prism, nitrogen gas purged binoculars. This high definition optical system is wrapped in a rubber armor that protects them in the harshest of conditions. Being waterproof and shockproof should give you comfort that no matter the animal you pursue, these binoculars will hold up to your grueling hunt.Specifications and Features: 8x magnification & 42mm objective lenses, these Crossfire HD bingos are optimized with Select glass elements to deliver exceptional resolution, cut chromatic aberration and provide outstanding color fidelity, edge-to-edge sharpness and light transmission. Fully multi-coated lenses increase light transmission with multiple anti-reflective coatings on all air-to-glass surfaces. Roof prism design is valued for greater durability and a more compact size.