1. Safe Material: This ice ball maker is made of food grade silicone and AS plastic. It is BPA-free, hygienic, non-toxic, and odorless. The silicone and AS material closes well. This makes the sphere ice cube mold will not fall apart when filled with water.2. Easy Release Design: The bottom of the ice ball maker mold is made of soft silicone. You can easily release the ice ball by squeezing the silicone bottom. We recommend you to leave the ice molds for 1 minute after you take them out from the freezer before releasing them. This will make the releasing easier.3. Refrigerator Decoration: This ball ice cube mold can decorate your freezer. When you take the ice cube mold out of the freezer and take the perfectly shaped ice balls out of it, you will feel that making ice balls is not just a process, but a pleasure.4. Large Ice Cube Molds: Just one extra large ice ball can keep your drinks cold and refreshing for a long time. Large ice balls melt more slowly than smaller ice cubes, which allows your drink to retain its flavor without being diluted as quickly. You can put a large ice ball in before drinking iced tea, cocktails, whiskey, coffee and enjoy your drink.5. Easy Fill Design: You can add water to the mold through the top fill spout without having to split the ice ball mold in half before filling. The transparent AS lid allows you to see the water level and stop filling in time.