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 thumbs so you can put your shot through the narrow window of opportunity in the most extreme conditions.Features:- Fast flip-open design - keep 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 - Size: 30