140 Counts regular mouth canning lids perfect fit ball and kerr regular mouth mason jars and other 70 mm regular mouth glass preserving jars or bottles. The back of the jar lids is made of food-grade polymer materials, which will not react with acidic food, rust-proof and corrosion-resistant. Our disposable food jar lid will not warp or bulge during water bath canning, pressure canning and refrigerator storage. The jelly jar lids have outer edge silicone sealing ring so it will create an airtight seal and prevent leakage for hassle-free storage. The Lids will works great for canning fruit preserves, sauces, jams, juice, jelly, meat and veggies.