With this pair of Bad Kitty Nipple Pumps you could achieve permanently stiff nipples! Included with the nipple pumps are a set of 4 differently sized pairs of fixing rings. For use, simply slide one of the rings over the pump opening and then slip this over the nipple. Gently squeeze the pump ball. The sucking vacuum makes the nipple swell with pleasure/pain and will remain erect if you put the fixing ring over the nipple. Available in Red/Clear as pictured.