... /s , food-grade antibacterial PP ,AS plastic. 2stainless steel car mug/travel mug/ stainless steel car mugItem No:WYQ-SP023Double layer food-grade ... temperature,it couldnt let water keep boiling. Plastic outer,and stainless steel inner . Convenience for drinking,and even in driving,the water ... . Easy for cleaning ,and difficult for sliding on the car. stainless steel car mug with handle