Premium Tinplate Material: Our canning lids are made of tinplate (not stainless steel), which can be reused many times, can withstand high and low temperatures, can be used in refrigerators, microwave ovens and dishwashers. Excellent Sealing Performance: The sealing ring inside the jar lid makes the mason canning jar lids have good sealing performance, airtight and leak-free, tightly seal ensures it's suitable for keeping food, grains, dressings, drinks fresh, no need to worry about leakage that may contaminate the kitchen or other places after sealing materials 150 PCS Regular Mouth Canning Lids Set: Our product is only the 150 mason jar lids (the band is not included), each diameter size is 2.76 inches / 70mm, compatible with most ordinary regular-mouth mason jars. Split Design: The band can be applied in combination with silicone fermenting lids and stainless steel sprouting lids, the screw thread on the container mouth can increase the friction force of hands, which facilitates the opening of the container.(Please note our producindividuals do not include canning bands) 100% SATISFACTION - If you receive a damaged product or have any other dissatisfaction, contact us and we will do our best to offer a satisfactory solution for you within 24 hours.