Pumped nipples with snake bite suction . These work so well, and I've loved them for years since I was 15 yrs old. ( now 71 year old gay male) but 4 months ago a friend of mine loaned me a set of heavy duty plastic, that you put over your nipples and screw them up for a suction. Wow hot My nipples are now 3 " long and as thick as my thumb. Love them. I keep them on for 6 minutes 3 times a day. and what a set of nipples I have .........................daddy