These Japanese style nipple clamps easily attach to both nipples for some stimulating nipple play. The two clamps are attached together using a 12-inch chain. They are applied by squeezing the edges of each clamp and attaching it to the nipples. The contact surfaces of the clamps are fitted with a rubber pad made with a nubbed surface. These nubs will grab and hold the skin surface without breaking into the skin. There is a medium strength tension on each clamp. However the tension can be increased by pulling on the chain for a more effective sensation. Each clamp measures 3.5inches in length and 1.5 inches in diameter. The clamps and chain are fashioned out of stainless steel.