BARSKA 10x42 Storm EX Binoculars Versatile binoculars with 10x magnification and 42mm objective lens Fully multicoated optics optimize light transmission to create bright images O-ring sealed for 100-percent waterproof protection; advanced open bridge design Dry nitrogen-purged and sealed to prevent fogging; high-quality BaK-4 prisms Optimum long eye relief with twist-up eyecups; weighs 21.16 ounces; lifetime warranty