Simply the ultimate scope lens protection for hunters and shooters. They're custom-fit to your scope, create a watertight, airtight seal, and open with a touch of your thumb, so you can put your shot through the narrow window of opportunity in the most extreme conditions. Features Include: Fast, flip-open design keeps your eye on the target, Silent spring hinges won't spook game, Water-tight, custom-fit friction mounts anchor them to your scope, Air-tight semi-O-ring keeps out dust and moisture, Tested to -40�F, Truly ambidextrous, Weigh less than an ounce, Also made for spotting scopes. Sell Unit Each.