... X(bottle B) Bottle: silicone,heat-resistant to 200,sterilizable. Nipple: cross cut silicone nipple,heat-resistant to 200 ,sterilizable. ... Twist Cap: polypropylene,heat-resistant to 120,sterilizable. ... ,match with twist cap,polypropylene,heat-resistant to 120. Features: (1),safe silicone material,colorless,odorless,nontoxic,high ...