M2M Nipple Clamps with Chain Chrome. Nipple Clamps Jaw Ends with Black Chain. Titillation with a touch of glamor! Jaws clamps are also referred to as clover clamps, butterfly clamps or endurance clamps. This clamp is of Japanese design and can provide increasing tension if pulled, can be done by the chain. The clamp itself is flat and is 3.5 inches long by 1.50 inches wide. The clamps are made from aluminum and are connected by a 12.5 inches steel chain. The clamp is applied to the nipple and the spring tension holds the clamp in place. The clamp usually provides a very high pain level, and is usually only used by more advanced users. To increase tension on the nipples, small weights can be attached to the ends of the clamp. As increased pulling tension is applied to the clamp, it will cause the jaws of the clamp to close tighter. Another method is to use the clamps to keep a person in one place. If cord is tied from the clamp to a fixed place, the wearer of the clamps cannot move away because the clamps will tighten as they move. Eventually the clamps would be pulled off the nipples but not before considerable pain is felt. Nipple clamps can be applied to the nipples of either men or women. They create pain/pleasure by restricting blood flow from erect nipples by applying pressure to them. Most nipple clamps are adjustable allowing the user to determine the amount of pressure.