Ball one-piece leak-proof lids feature a one-piece, screw-on design that is leak-proof, airtight, AND freezer and dishwasher safe. Store your favorite recipes in iconic Ball jars and secure with Ball leak-proof storage lids. The airtight seal is perfect for herbs, spices, on-the-go salads, smoothies, and more and is freezer safe for storing jam recipes, sauces, and soups.   Leak-proof, airtight design Freezer safe for food storage Dishwasher safe for easy cleaning BPA-free Not safe for canning or microwave use