Fetish Fantasy Series Japanese Clover Clamps for your pleasure. Make your nipples perk with pleasure with these Metal Clover Clamps. These butterfly style nipple clamps are spring-loaded and fitted with rubber grips for extra comfort. Pull on the string to increase the tension...the harder you pull, the tighter they grip! It never hurt so good! Please note these nipple clamps are for endurance and do not adjust. Metal, cork-lined clover type nipple clamps with long nylon cords.