Come and see our amazing products. single-layer 304 stainless steel shake cup is produced according to European and American stanards,It is not vacuu, please use warm water or cold water to brew nutritious powder.Be carefull to pour hot water into the the bottle.The lid is a food-grade PP plastic 304 stainless steel ring. Pls confirm further with us if any query about packing info, inventory status and time schedule.