Cap and Seal mason jars or storage jars with these reusable jar caps. Made from BPA-free standard silicone, they are dishwasher safe, and form a seal for food storage. Available in two sizes to suit the wide mouth or standard storage jars. Simply push firmly down on the edge of the cap to seal the jar. To open, just pry up on the edge of the cap, and it pops loose. While they are not suitable for pickling and canning, they will keep an airtight seal over your jams and pickles, and they are great for storing loose rice and grains, spices, and other dry food items.