Correcto Rings are great to naturally enhance and enlarge flat or inverted nipples. They are perfect to help with breastfeeding issues, or as a nipple enhancement. There are 4 sizes, so there should be a size for everyone. They are a good nipple prep to help babies latch on to make breastfeeding easier. I now offer combo packages, to get more of the ones you could use. The small package is the Yellow and Blue bands. The medium package is the blue and the pink bands. The large pack is the pink and purple bands. There is always the Sample pack with all sizes which is the preferred choice if you don't know which sizes will work. PLEASE NOTE: DUE TO THE NATURE OF THIS PRODUCT, I CAN'T ACCEPT RETURNS AS I DON'T RE-SELL THEM, FOR OBVIOUS REASONS, WHICH WE ALL CAN APPRECIATE. THANKS FOR UNDERSTANDING!