This premium, open-hinged short-to-long range roof prism ZULU7 lightweight binocular utilizes our industry leading HDX optical design that combines extra-low dispersion glass with high light transmittance glass to provide you with the maximum in color, image brightness, and absolute clarity. Fully multi-coated roof prism binocular incorporates super high reflectance phase-coated BAK4 prisms for unmatched resolution and image contrast. The ZULU binoculars incorporate a magnesium housing to ensure they can survive rugged conditions.