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 gives the mason jar lids good sealing performance, airtight and leak-free, tight seal ensures it is suitable for keeping food, cereals, salad dressings, drinks fresh, no need to worry about leakage. which may contaminate the kitchen or other places after sealing the materials 100 Pack Wide Mouth Canning Lids: Our product is only 100 pieces mason jar lids (the band is not included), each diameter is 3.4 inches, compatible with most regular wide mouth mason jars, not compatible with other regular jars. -mouth Split Design: The band can be applied in combination with silicone fermentation lids and stainless steel sprouting lids, the thread on the bottle mouth can increase the friction force of the