Medela breastmilk bottles are made from safe, BPA-free polypropylene that retain breastmilk's beneficial properties. Features and Benefits Compatible with all Medela breastpumps to pump, store and feed with one bottle. Easy to read volume marks in ounces and milliliters. Dishwasher and microwave safe. BPA-free. What’s Included (3) 8 oz breastmilk bottles (3) wide base medium-flow silicone nipples (3) collars (3) solid lids (3) travel caps Medela's Commitment to Breastfeeding and Breastmilk: Medela is committed to supporting the WHO Code’s call for commitment to breastfeeding and breastmilk as the optimal nutrition for the growth, development and health of babies. In line with the AAP Guidelines on introducing bottle feeding, Medela recommends that breastfeeding be well established before introducing a nipple.