A SIMPLE REMEDY FOR FLAT OR INVERTED NIPPLES: With gentle suction, the nipple is extracted into a small plastic cup. Within weeks of continued wear, the nipple will stay permanently erect EASY TO USE: Hold the aspirator to the nipple with one hand and apply suction by pulling the syringe with the other (a small smear of a petroleum-free lubricant at the base of the aspirator may improve suction) NON SURGICAL: Uses gentle suction to stretch the milk duct - painless, without surgery. Basically your nipples are not sore, practice more, noticeable improvement after a few days. Be patient PACKAGE INCLUDED: 1 set (1 piece syringe puller 2 piece corrective glass). Material: PC silica gel. The adjuster with invisible signs of use and easy correction can be placed in the underwear so that others cannot see it from the surface. Due to factors such as Manual measurement and display differences, there may be slight differences between individual products and pictures, please excuse me.