These black nipple tweezer clamps use a simple application for giving your partner some enjoyable nipple play. Place the clamp near the nipple and pull on the small circular tightener attached to each clamp. This will cause the clamp to close around the nipple. Pull the tightener until you find the ideal amount of pressure against the nipple. The two clamps are attached together by a 12" chain for a uniformed look. The clamps are made of a rubber-coated metallic material.