[Good tightness]: No leakage, tightly sealed. The lid of the mason jar is equipped with a silicone ring. The canned lid is suitable for keeping , grains, seasonings, and beverages . You 't need to worry about the leakage of sealing material contaminating the kitchen or other . The lid of the mason jar can be compatible with the regular mouth of most 7 cm mason jars, but not compatible with other wide mouth mason jars or bottles. Packing list: 24 mason jar lids. Dimensions: 2.75 inches/7 cm in diameter. The lid can be to store leftovers, sauces or juices, dry goods storage, spices and other small items. In addition, you can use a marker to mark -related information on the lid of the Mason jar, or write the date on the lid, which can help you record the time of production and purchase. [Material]The Regular Mason Jar Lids are made of tinplate, and there is a layer of silicone ring inside and can be reused many times.canning lids are resistant to high and low temperatures, so canning lids are suitable for refrigerators, dishwashers and microwave ovens, you can use Canning Lids to replace your rusted metal lids.