Butler Creek Flip-Open Scope Caps feature a fast, flip-open design to keeps your eye on the target. Silent spring hinges that won't spook game. Water-tight, custom fit friction anchor them to your scope. Air-tight semi-O-ring keeps dust and moisture off your lens and these caps open with a touch of your thumb, so you can put your shot through the narrow window of opportunity in the most extreme conditions. 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 Weigh less than an ounce. Rugged polymer material can withstand the hottest or coldest climates