Made of transparent food-grade soft silicone material, safe and non-toxic, harmless to human body. Humanized bump idea, let bumps scattered around the breast, just like mother's areola. The petal design makes mom lighter and easier to fix, and also maximizes the skin-to-skin contact between mother and baby. Super soft, light and full of flexibility. Cross milking holes, variable flow teat, suitable for babies of all ages. The nipple designed with spiral mechanics makes the nipple not easy to dent when the baby is feeding. The space between the mother's nipple and the head of the nipple shield prevents the baby from biting the nipple.