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These silicone sealing rings make many Mason jar lids leak proof and air tight! They are designed for white plastic Ball storage caps, Mason Jar Lifestyle plastic storage lids, and MJL stainless steel lids. They fit many other types of one piece Mason jar lids. Made of platinum cured silicone rubber, these seals are dishwasher, freezer, and microwave safe! They’re easy to remove and clean. Silicone is a non plastic, BPA-Free material for food use that does not leach any chemicals. Platinum cured silicone is the highest quality available. Platinum catalyst curing is the most expensive method, but does not leave behind any byproducts. Get the purest, food grade, uncolored silicone sealing rings for your jars! 10 seals per package. The wide mouth seals are 86mm (3.4″) outside diameter, 69mm (2.7″) inside diameter, and 3.4mm (.13″) thick. The regular mouth seals are 70mm (2.75″) outside diameter, 50mm (2″) inside diameter, and 2.6mm (.1″) thick.