Weaver Grand Slam Binoculars (10 x 32) Torture tested from -20 to +150 Fahrenheit Phase coated lenses for the ultimate in light transmission and roof prism design with BK-7/BaK-4 prism glass Rubber armor finish Extendable eyecups for comfortable viewing sessions through waterproof and fogproof performance optics Nitrogen purged tubes, rugged body armor and lenses