The miniature Nipple Cylinders were uniquely designed to give your nipples a real workout. After all you deserve it. They are fully handcrafted, hand polished. ncludes 2 Cylinders, one for each Nipple. State of the Art Lucite Cylinder. Other sizes are also available. Top Quality from Boston Pump Works U.S.A. This includes two Nipple Cylinders only, the pump is not included. PUMP SOLD SEPARATELY