These aren't your normal nipple clamps! Designed after the classic, painful clover clamps these have an added twist! Not only do they increase in pressure when you pull the long, 12 inch chain They also have spiked rubber tips that dig into the skin and give you an extra bite of pleasure and pain! Made out of nickel-free metal they are perfect for those who like intense nipple stimulation and have sensitive skin. To clean, simply use warm water and mild soap and soak the chain and clamps in them. For more serious cleaning, use a combination of rubbing alcohol and water. Spray with a toy cleaner for good measure after each play session and keep them on hand or slip them into your toy bag to add some spice to any scene!