3 removable covers: use the covers to stack the ice cube trays, keep the cubes clean and protect them from odours picked up by the freezer (Note: the cover is only an additional cover that cannot prevent leaks). . Food grade silicone material. The ice cube trays are made of silicone and PP, are BPA free and LFGB certified. . Easy release with silicone base: the unique design of the silicone base makes it easy to remove ice cubes. Rinse the bottom with water, press on the bottom and the ice cubes come out quickly. . Mini ice cube box: each bowl contains a total of 6 large cubes (3 x 3 x 3 cm) of 18. . Easy to clean and reusable, they can withstand temperatures from -20 to 240 C and are safe for use in refrigerator and microwave. Perfect for freezing and storing baby food. .