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:Fast, Flip-open design keeps your eye on the targetSilent spring hinges won't spook gameWater-tight, custom fit friction mounts anchor them to your scopeAir-tight semi-O-ring keeps out dust and moistureTested to 40 deg FTruly ambidextrousWeigh less than an ounceAlso made for spotting scopes