It is essential to ensure the safety of breast milk: the bottle body is made of food-grade borosilicate glass. While ensuring that it can be refrigerated, heated and stored at normal temperature, it does not contain any harmful substances, and there will be no plastic smell seeping into the baby's milk (the penetration of harmful substances will lead to plastic smell). There is no need to worry about the safety of breast milk. All parts can be disassembled for cleaning. Three-in-one wide-necked glass bottle is used for pumping, storing and feeding: the bottle is suitable for the Breast Pumps & Nipples, so mothers can pump, store and feed with the same glass bottle to reduce the transfer of breast milk and save precious breast milk. 100% leak proof and 10 ml fine measurement mark: silicone sealing disc is used, so there is no need to worry about leakage; The bottle has a 10 ml increment measurement mark. You know how much milk you produce. The ballpoint pen can be written on sealing disk to mark important matters. The mark can be erased and marked circularly. It can ensure the safety of infants and young children: The bottle has a strong resistance to falling. When used, it can not only guarantee the use time limit of the bottle, but also avoid the safety hazards brought to infants due to broken glass. Glass bottles are not only healthier for infants, but also easier to clean than plastic bottles, because glass bottles are unlikely to leave residue and odor scratches. Our commitment: be ready to become a fanatic. As parents, we know how important it is to only use the best products for our children, so all of our products have a problem-free refund policy. If you are not happy, neither are we. Just contact us and we will provide you with VIP services. Bottle material properties:1. It is not only resistant to stains and smells, but also heat-resistant and heat-shock resistant glass. Its allowable temperature difference is 270 degrees Fahrenheit (150 degrees Celsius). The bottle mouth is compatible with the flange of Avent manual pump and Avent electric pump, and the closed collar is used with Avent natural nipple, so mothers can use the same glass bottle to suck, store and feed milk to reduce the transfer of breast milk, preserve precious breast milk and provide nutrition for babies. There is no BPA, BPF, BPS and phthalate.2. Leak proof cover with awritable/erasable surface, label name/date, used as storage bottle, milk collection container or baby food container. Leak proof and easy to clean1. Screw cap and sealing disc are specially designed to prevent bottle leakage. Perfect for freezing, traveling, flying and camping.2. The measurement marks of breast milk storage and feeding are clear and not easy to wash out.3. Glass bottles are not only healthier for infants, but also easier to clean than plastic bottles, because glass bottles are unlikely to produce residual and odor scratches. ATTENTION1. For 6 ounces of Botox, the freezing line is 5 ounces. If you want to freeze milk, please do not put more than 5 ounces of milk in the bottle.2. For 8 ounces of Botox, the freezing line is 7 ounces. If you want to freeze milk, please do not put more than 7 ounces of milk in the bottle.3. Don't press lid, to avoid breaking the seal, do not press the disk, and do not use Spectra bottom cap on Mayom glass bottom Leak will happen.