The Tweezer Nipple Clamps each come with a 50g weight attached which applies downward pressure to the nipples. Individually adjust the level of pressure experienced on the nipples by sliding the metal ring up or down the tweezers. The closer to the end of the clamp, the tighter it gets. Each tweezer clamp also has a rubber coating making them less harsh on the skin. Total length: 4 inches. Material: metal.