Come and see our amazing products. Stainless steel automatic mixing coffee cup exterior material stainless steel, the inner edible part is PP plastic. The product can hold 400ml of liquid and the product supports 2 AAA batteries. The lid has a heat sinking hole and a suction tube for easy drinking. The sealed lid also maintains the temperature of the liquid. It is completely silent when stirring, does not interfere with the rest of others, and can be tasted low in public. Pls confirm further with us if any query about packing info, inventory status and time schedule.