The Amulet D-vice Adjustable Nipple Clamp Set is an effective training tool in the art of endurance and sensation play. These exquisite clamps come equipped with an adjustable barrel so the wearer can graduate to a tighter fit. The TPR coated clips are designed to accommodate the natural curvature of the nipple. Use your imagination, this devious set includes a convenient O ring that can be weighted, laced, etc. It is your domain...you decide Measurements: Can open up to approx. 0.75 inches wide, closes completely. Material: Heavy duty brass with TPR coated tips. Color: Silver and black