Material: Our coffee mugs are made of high quality stainless steel. They have a smooth mirror finish on the surface and a brushed finish on the inside. Dishwasher safe. Kids and Toddler Size: Perfect little stainless steel mug for small hands They're only suitable for small drinks or small children. They are lightweight but strong and so much better that plastic. No sharp edges, safe for kids to use. Double Wall Design: Elegant design and the double walled construction keeps hot things hot and cold things cold longer than ceramic cups. Drinks stay hot, outside gets warm but not hot. Widely Use: Not only for kids to use around the house or camping, picnicking and traveling. Would also be a lovely creamer/espresso mug for grown ups, perfect for a few shots or a small cup of coffee.