Riton Optics 3 Primal Binocular 10x42mm Bak4 Prism Center Focus Black Magnesium Aluminum Alloy The 3 Primal 10x42 HD binoculars from Riton offer vision and clarity well beyond your expectations. The HD glass optical system is encased in a lightweight PVC-wrapped magnesium-aluminum alloy. The HD glass and BAK4 prisms provide clear and bright images, and weighing just under 27 ounces, the 3 Primal 1042 HD binoculars wont strain eyes or arms. Brand Riton Optics Category Binoculars Series Primal Model 3 Magnification 10x Color Black Material Magnesium Aluminum Alloy Finish Rubber Field of View 341 ft @ 1,000 yds Objective 42mm Close Focus 8.20ft Length 5.82" Focus Type Center Prism Type Bak4 Width 5.03" Weight 1.67 lbs