Food Safety Material: This ice cube tray silicone is made of food grade silicone material which is non-toxic, soft and BPA free, easy to clean, washable and reuasble, dishwasher safe. (Please don't add too much water in case the ice and the cover sticking together or the ice spills out when freezing and make sue the lid is covered tightly to the tray) . Sphere & Square Cubes: 2 shapes of ice cube moulds in one set to meet your different needs. The 17.5*12*5cm size sphere ice ball mould can make 6 spherical ice balls with a diameter around 4.5cm. And the 16.5*11.5*5cm size square ice cube mould can make 6*5x5x5cm square ice cubes. . Easy to Release: Due to the soft silicone material and non-sticky design, these ice cube trays are easy to release compared with traditional plastic ones. A few seconds after taking out of the refrigerator, gently twist the tray and press the bottom with your fingers, you will get the nice shaped ice cubes and balls. . Convenient to use: The ice mold is equipped with a lid to help prevent overflow, excessive freezing or contamination. These reusable ice trays can also be stacked to save your space. And a bonus funnel to simplify the liquid filling of the ball mould. (There might be a ring around the ice where the two pieces of the tray come together if the two parts are not closed tightly due to the locking design of the round tray) . Various Application: Our ice cube tray with lid can make larger ice cubes and balls to give you a longer iced taste. Round/square ice cubes are suitable for making cocktails, wine, liqueurs, whiskey, iced tea, iced coffee drinks, juices, popsicles, frozen seasonings and baby food. You can also put some fruits in the ice cubes, mint to decorate lemonade, cocktails, etc. Happy DIY .