QUALITY MATERIALS: Our premium 304 Stainless Steels kids mugs are made of food-grade stainless steel with a silicone outer coating. Odor Free, Eco-Friendly, BPA Free.. ?? DURABLE: This mug will never rust, bend or break with regular use – hand washing recommended.. ?? GREAT FOR KIDS: Our stainless-steel mugs are kids friendly with smooth, safe edges and made for child sized hands. The silicone design, on the outside of the mug, protects your children’s hands from hot or cold beverages.. ?? SLASH PROOF LID WITH SLIDER CLOSURE: BPA FREE plastic lid with slider closure helps keep your child drink hot or cold and makes it a breeze to sip his/her favorite beverage.. ?? HELP COMBAT PLASTIC WASTE: It’s time to move away from the regular kids plastic cups and by doing so help protect the future of our planet and oceans by reducing plastic waste..