Stainless Steel Mugs Comes with High Quality of Double Wall Steel, it's 100% Food Grade Stainless Steel & BPA Free. It's lite weight and unbreakable thing of stainless steel, making the perfect Sets of your Kitchen. you can use this mug for long time. Good for kids, You can Use this Mug For Your Kids With Daily Uses item. this item can't broken easily and heat won't transfer to outside so quickly.