Material:PP Moms best choice, Press evenly,smoothly sucked without trouble, safe, comfortable and healthy.do not contain harmful substances.High temperature resistant, easy to clean, more safer. Health tips: 1. Wash hands before using milk pump to milk or treat breast milk. 2. The breast pump is hot with a hot towel before milking. Massage stimulates the areola to make the breast completely clear. 3. Milking at your own pressure. Breasts or nipples should stop milking when they feel pain. 4. Just squeeze out the amount of eight points for milking (no more than 20 minutes) 5. Use a lidded container when storing breast milk 6. Remove breast milk that has been refrigerated for more than 72 hours (3 days) 7. Do not put refrigerated breast milk and fresh breast milk together. 8. Thaw the refrigerated breast milk or link the container to the warm milk for warm feeding. 9. After the defrosted breast milk is thawed, if the baby can not finish drinking after 26 hours, please do not repeat the refrigerated breast milk. Dispose of the remaining and disinfect the container.