The sealing band inside makes the canning jar lids have good sealing performance, the screw thread on the bottle mouth which greatly increase the friction of hands, which improves the sealing property and facilitates the opening of the bottle. Seal in the freshness and enjoy freshly tonight or tomorrow, can be used with most regular mouth jars. Features - Material: Tinplate. - The sealing ring inside the jar lid makes the canning jar lids have good sealing performance, air tight, tightly seal it' suitable for keeping, grains, dressings, drinks fresh, need to worry about put into the boiling water - Our regular mouth jar rings 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; our jar rings can be used with most brands of bottles - Suitable for sealing the canning jars that stored spices, sweets, biscuits, fruits, jams, drinks, tea or coffee, nails, screws and small objects, please make sure the size before purchase - Suitable for sealing the regular mouth canning jars that stored spices, sweets, biscuits, fruits, jams, drinks, tea or coffee, nails, screws and small objects - You will get regular mouth canning lids, adequate quantity for you to use, replace and sharing with your family or friends Package list: 32 x covers