Deliver or receive intense erotic pain and pleasure through direct stimulation to your nipples. This set of twistable vacuum nipple suckers provide breathtaking sensations, causing blood flow to engorge the soft, delicate tissues. Place the rim of the sucker around your nipple or other sensitive area and twist the top clockwise to automatically create a suction seal. Use this twist knob to adjust the suction intensity, pushing yourself to the limits of pain and pleasure!