The Perfect Fit Nipple Enlarger is a sexy way to give yourself fuller, erect nipples by use of a double bulb pump. This enlarger has an added unique feature: four graduated O-rings to place over the nipples to keep them standing at attention for extended sessions Simply place the desired size ring over the open end of the pump prior to pumping, fit the pump over the nipple, then pump away to your desired size. Slide the best suited ring over your now erect nipple, down to the base of the nipple. Now stand back and admire those perfectly perky tips Two differently sized pumps are included for a custom fit to any nipple. Measurements: Pumps are 2.63 inches long, Large Pump opening has 0.53 inch inner diameter, Small Pump opening has 0.35 inch inner diameter, O-Rings range from 0.33 to 0.54 inches inner diameter, Material: Rubber, Glass, Color: Flesh, Note: Includes a total of 8 rings and 2 pumps