These nipples can be used with bottles designed for direct nipple feeding at maternity hospitals. This is a set of 3, including one SSS size and two SS sizes. The SSS size was purchased a year and a half ago, and the SS sizes were purchased 3 months ago. I believe each has been used about 10 times. They will be sent via post. If you purchase these at the same time as the bottle set I have listed separately, I will offer a 300 yen discount.