Come and see our amazing products. This shaker cup is made of pp which contain a ball in the cup. It requires warm or cold water. but it cannot stir high temperature liquid. If the high temperature liquid is stirred, the pressure in the cup will increase, which may break the small lid at the top and ejecta liquid.There is ball in the cup Pls confirm with us about the packing info, stock status and exact production time before placing your orders.