These are mosaic tips, which are very popular in Japan right now. They're these bumpy tips that you fill with gel or l&p. They're so gorgeous.... this is my second time trying them out. I'm supposed to be using the specific gel provided by the tip's company, but I haven't ordered them yet. I used Bio for the moment. I'm not having any problems at the moment. The downside of these? They're a nightmare to keep clean... I have to carry around a nail brush in my purse!