The nipple kit is designed to create suction and increase blood flow to the nipple/areola region. Increase sensitivity to the nipple prior to sexual intercourse. Highest-quality medical-grade acrylic with a comfortable flanged base for a secure seal. The vacuum valve on the cylinder could hold suction even after the hose is disconnected. The quick-release valve on the pump could break the suction easily and safely. 100% silicone hose. The pump in this kit can also be used interchangeably with other parts. Instructions for use: Lubricate the cylinder and the intended area as well. Slowly begin to work the pump. there will be a slight pressure on your skin as air is drawn from the tube. For beginners, it is important to start this process slowly to avoid discomfort. Remember to press the safely-release valve if the pressure becomes too severe. Continue pumping/releasing air until you've found a level of pressure suitable for you.