Quantity: each package includes 20 sets of split-type lids(40pieces in total, 20 bands and 20 lids), suitable for regular mouth mason jars(2 5/8 inch wide mouths), cannot match with wide-mouth mason jars and bottlesSize: this product is split-type lids, which includes bands and lids, the two parts can be separated or put together; the inner diameter of the metal ring is 5.6cm/2.2inches, its outer diameter is 2.8inches, and the diameter of lid is 6.8cm/2.7inches, suitable size for regular mouth mason jarsMaterial: the metal ring is made of high quality tin, which is durable, can be used for many times; it is also can withstand high and low temperature, thus can be used in the refrigerator and microwave oven; it is available to clean in a dishwasher; can be used with most mason jars. Note:please dry the the mason jar lids after cleaning.Each package includes 20 sets of split-type lids, convenient for you to replace the lids or rings of a long time or damaged, safe and hygienic, the lid and ring can be replaced separately, which is more economical; sufficient quantity can meet your various needsThe lids of mason jars used in the kitchen often get rusty, and our mason lid is rustless, with which you can replace the rusty ones, and avoid disposable lids for environment protection; sterilize them by boiling hot water after use for your health