I have very sesitive nipples and I enjoy extreme nipple play. My top saw these and got them for me and I have to say that they are incredible. It took a little time to get them on at first but after perfecting the apllication my nipples are now about a half an inch in length...no problem getting them on now. As the rings tighten, the all-encompassed nipples swell significantly creating a very intense pleasurable pain. This kit is for the experienced nipple player only