Come and see our amazing products. It is made from unbreakable 304 18/8 food grade stainless steel. No need to cure and super easy to clean. Double-wall design keep the outer wall cool at all times. It can be used indoor or outdoor, not only for Yerba mate, but also perfect for enjoying any drinks. This cup has a narrow base and a wide opening, the best shape for optimal yerba mate flavor and duration. It's an excellent DIY gift as you can add any designs you want, really suitable as the customized gift for your friends, family and company gifts. Pls confirm further with us if any query about packing info, inventory status and time schedule.