... use food grade liquid silicone, not conductive to the growth of bacteria. It is BPA free, even in high temperature. ... deformation after high temperature sterilization.No strange smell: It is made from non-toxic, colorless and odorless liquid silicone, ... from the bottle to save space when traveling.Durable, long-term use, soft and strong, difficult to break, only need to replace the nipple to use, ...