Features: - The sealing ring inside the jar lid makes the canning jar lids have good sealing property, air tight and leak free, tightly seal ensures. - Suitable for sealing the mason canning jars that stored spices, sweets, biscuits, fruits, jams, soft drinks, tea or coffee, nails, screws and other small objects. - 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. - The outer rim of the cover ring is threaded to increase the friction for easy opening of the canning jar, convenient for you and your kids to carry food within mason canning jars at work or at school. Specifications: Size: 70mm Material: Tinplate Package included: 12 sets of Regular mouth jar lids and band Notes: 1. Manual measuring, please allow 1 ~ 3mm error,thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.