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. BPA FREE plastic lid helps keep your child drink hot or cold and makes it a breeze to sip his/her favorite beverage..