BARSKA Waterproof Storm Open Bridge Binoculars Versatile binoculars with 10x magnification and 50mm objective lens Fully multicoated optics and Bak-4 prisms help create bright, crisp images O-ring sealed for 100-percent waterproof protection; advanced open bridge design Dry nitrogen-purged and sealed to prevent fogging; center focus ring Optimum long eye relief with fold-up eyecups; weighs 35.97 ounces; lifetime warranty