SAFE MATERIAL: These ice ball mold and skull cube tray are made of food grade silicone. 100% BPA Free, Non-Toxic, Food grade, Leak-free, Microwave safe, Oven safe, Dishwasher safe. Please pay attention that you should add water to the skull ice mold, then cover the lid, not add water from the small hole on the lid. CREATIVE & FUN: Our vivid skull ice mold makes your drinks awesome. These silicone ice cube trays can be easily twisted or release from the bottom to remove cubes in seconds. SUITABLE FOR MANY PLACE AND DRINKS: Our ice ball make