I am at a mixed review for these. The ones that came with the gift set were AMAZING ! Lasted me a long while & were the only nipples (& bottles) that my son loved. As he grew older, I went & bought him these fast flow nipples & they didn't last at all. Of the 6 nipples I purchased, 2 ripped at the hole part when going through a first cleaning.. then the rest followed a few weeks afterwards. Let's say I only have 2 nipples left at the moment. Really disappointed.