Bushnell Trophy 12x50 Waterproof/Fogproof Roof Prism Binocular Fully multi-coated lens and BaK-4 roof prisms for bright, clear, crisp viewing O-ring sealed and nitrogen-purged for waterproof and fogproof Twist-up eyecups for quick and easy adjustment for optimum eye relief 50-millimeter objectives for bright, clear images 12x magnification