Master Series Power Pins Magnetic Clamps from XR Brands. Surround your most sensitive parts with magnetic pressure! The Power Pins can be applied to nipples, labia, scrotum, and more. Use them during solo or partner play to create an unforgettable aesthetic and a painful pinch of pleasure. The ultra-powerful magnets will be drawn to each other on either side of your delicate flesh, acting as a pair of clamps that feel as good as they look. Power Pins are nickel free so as not to irritate sensitive skin.