Nothing to say, delivered quickly and my nipples which at the beginning were sensitive (but without cracks) are not at all since I used them, it is indeed magic! The shell holds all the milk that flows from the 2nd breast when my daughter is sucking on the 1st breast (essential because otherwise it flows everywhere) and I sometimes wear them outside if outside for more than three hours, in case of leakage). Go with your eyes closed, whether it’s these shells or the competitors with a better known name, because in the end it’s the same principle that saves the problems sometimes encountered when breastfeeding. The medium size fits me very well (I don’t have identical nipples, neither small nor super large for information).