LEAK PROOF AND FREEZE - Our lids are made of 100% food grade material, not only easy to put on and , but also tight enough to keep the ice cream container airtight, no more leaks or spills. Thanks to the tight-seal lid design, the lid seals out air and prevents freezer burn, keeping your ice cream, gelato, sorbet, or other freeze treats as fresh as possible. Dishwasher Safe Our lids and containers are both dishwasher safe (top rack recommended). With clear containers, you can easily identify and locate content without labels and annotations. Do not fill too much and exceed the maximum capacity line. Do not swirl while mixture tilts to one side. Do not handle hot ingredients.