3 removable covers: Use the lids to stack the ice cube trays, keeping them clean and protecting them from odors absorbed from the freezer (Note: The cover is just an extra cover that cannot prevent leaks. Silicone (food grade): The ice cube trays are made of silicone and PP, BPA free and LFGB certified. Easy release with silicone base: The unique silicone base design makes it easy to remove ice cubes. Rinse the bottom with water, press the bottom and the ice cubes come out quickly. Mini ice 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 ranging from -20 to 240°C and are without safe for refrigerator and microwave use. Perfect for the freezer and baby food storage.