The Hevea Baby Glass Bottle is made from neutral borosilicate glass and has a natural rubber nipple with an anti-colic valve. The 2-pack bottles comes with a medium flow nipple. If you prefer a slow flow nipple, this can be bought seperately. Borosilicate Glass Borosilicate glass is used by high-end restaurants, laboratories and wineries. The composition of the glass makes it very heat and thermal shock resistant and can resist extreme changes in temperature without cracking. Furthermore, Borosilicate Glass Bottles are highly hygenic due to the smooth and non-porous surface. They don't absorb nor leak taste nor smell from their substances or sorroundings. 100% Natural Rubber nipples Natural rubber is a plant based material derived from the rubber trees "Hevea Brasiliensis" in Malaysia. It is non.-toxic and free from phtalates, BPA, PVC and plastics. Leakproof Dust Cap The dust cap keeps the nipple clean in your bag and prevents liquids from leaking. 100% Natural Rubber Nipple The Natural Rubber Nipple is cherry shaped and anti-colic. It is soft and yet durable, resistant to teething and bites. Screw Thread The screw thread keeps the nipple in place. Screw caps produced from non-toxic pp (Polypropylene) 100% Borosilicate Glass Bottle The Borosilicate Glass Bottle is very durable, thermal shock-proof and highly hygenic. Natural Rubber Nipples Natural Rubber Bottle Nipples are plant based med from the rubber trees "Hevea Brasiliensis". They are completely non-toxic and free from PVC, BPA and phtalates. Care instructions Before use Wash the bottles thoroughly and sterilize in boiling water or in dishwasher. Leave the nipples in boiling water for 5 minutes prior to first time use. Daily maintenance During daily use it is recommended to clean the bottle in the dishwasher or wash it using a bottle brush. Always check the nipple for tear and wear. The rubber nipple should be replaced after 6-8 weeks of use. Natural, Breast-like and anti-colic The soft natural rubber nipples are cherry shaped and made to immitate the natural breast shape for a comfortable feed. The bottles comes with a medium flow teat with an anti-colic valve that reduces the air flow. The glass bottle is manufactured in Germany and the natural rubber teats are made in Malaysia, where the natural rubber is harvested from the rubber trees "Hevea Brasiliensis" 2in1 Bottle and Star Ball Slow Flow Nipples (2-Pack) Medium Flow Nipples (2-Pack) Buying Options Buying Options Buying Options 100% Natural Rubber Nipple and Star Ball (Bottle is glass) ✓ ✓ BPA-Free, PVC-Free, Phtalate-Free ✓ ✓ ✓ Recommended age 0-12 months 0-3 months 3-24 months Can be used for milk ✓ ✓ ✓ Can be used for milk ✓ ✓ ✓ Anti Colic ✓ ✓ ✓