Ergonomic design and extra comfortable shape making it easy to hold even for a baby’s tiny hand. 100% Food Grade Nipple and FDA approved liquid silicone rubber. The nipple of this steel feeding bottle does not break easily, neither does it gets torn out. Soft nipple designed to massage gums during teething. Made of 304-grade stainless steel which gives it durability, strength and ensures that the product does not crack. Both silicone nipple and 304-grade stainless steel used in this steel feeding bottle ensure that it is completely hygienic and safe to use for your baby kids. Please ensure Silicon Nipple is fixed properly to the Nipple Cap and the Cap is closed tightly to the bottle to avoid any leakage issues.