Pentax 62551 DCF WP II 8x42 Binocular (Black) Extremely durable, lightweight aluminum alloy body makes these binoculars extremely durable High-resolution phase-coated and super-reflective coated roof prisms provide high resolution, high contrast images Nitrogen-filled waterproof (JIS Class 6) construction allow these binoculars to be used in the most extreme weather conditions and be submerged to 1 meter Inner-focus optical design adds to the durability Rubber covered exterior provides a sure grip and protects the internal mechanisms