🥫Superior and Safe Material: Made of superior quality food grade thickened tinplate with BPA Free silicone seal ring, which enhances its durability and rust resistance, can withstand high pressure, No bending, corroding or cracking. Canning Lids are for one-time use only. 🥫Excellent Sealing Performance: With inside thickened silicone seal ring, makes the mason canning jar lids have good sealing performance, maintain cans inside food, grains, dressings, drinks fresh and clean condition for long time. 🥫Safety Buckle Design: You could judge if your canning sealing well by pressing down the the safety buckle on the center of the lid, if safety buckle is suck and you heard "pop", indicating that the seal is finished. 🥫Wide Application: The diameter of canning jar lids regular mouth is 2.76in/ 70mm, compatible with regular mouth Mason jars; Its split design makes replace the lids easy and reduce waste! Ideal choice for storing fruits, cookies, candies, salad, screws, etc 🥫Satisfication Guarantee: Your satisfaction has always been our greatest pursuit, If you encounter anything in the process of purchasing and using our canning jar lids, please contact us without any doubt, we will protect your rights and interests in all aspects and try our best to obtain your satisfaction.