Master Series Japanese Nipple Clamps. Ringed Monarch Clover Style Nipple Vice. Adjustable pinch clamps. A comely device of restriction and paradise. The Ringed Monarch is an effective training tool in the art of endurance and sensation play. These devious chrome clover style clamps are ideal for solo play or with the one you want to dominate. When the O-ring is pulled, the clamps pressure becomes more intense. Use your imagination, this devious set includes a convenient O-ring that can be weighted, laced, and more. In your domain: you decide. Measurements: nipple clamps are 3.5 inches long, including rings, 1.58 inches wide. Material Metal.