One of the finest kits of this kind on the market. The small rubber rings are stretched over the nipple. Blood flow is temporarily stopped numbing the area. When the ring is removed the returning blood flow creates an ever slowly increasing threshold of pain. Extraordinary sensitivity to the touch is created. Brass rollers and stems are used to hold the rubber rings. Kit includes 1-Pliers & 1-Bag of 100 rubber rings (TT205R). Use with caution.