These tweezer style nipple clamps come with a fully adjustable screw in attachment which can be adjusted to the optimum level. They also have a plastic coated tip meaning they are less harsh on the nipples. These clamps are attached to a generous 18 inch metal chain that leads you to an easy twist single speed vibrating bullet which is just what you need to take you over the top! Choose to use with or without the vibrating bullet. Batteries included.