Stainless steel: our covers are made of 302 stainless steel that does not rust and can be used in pressure cookers, microwave ovens and dishwashers, which are durable and will not deform at high temperatures Size: we have 2 sizes, wide mouth and regular mouth, which are produced according to the bottles produced by the local mason bottle factory in the United States as molds; it is suitable for most of mason bottles, please note that if you are buying glass bottles from non-professional manufacturers from Internet, you should check the corresponding size before you buy the lid The stainless steel mason lids can replace the rusty tinplate lids, you can use them in making all kinds of salad dressings, yogurts and pickles; they can be used as the seal covers of mason bottles; you can use a marker to write the date or name on the lid to easily keep track of the food preparation time Wide application: the lid can be used as a mason's lid for storing drinks, yogurts, cookies and candies, but can also be used for writing, drawing and printing patterns as holiday DIY tool; when you use it as a lid, please check the size of your mason jar and select the appropriate size of the lid Rich quantity: there are 36 stainless steel mason jars in each set, 2 sizes of regular mouth and wide mouth, suitable for all kinds of mason jars; our sizes are customized according to American brands and suitable for all kinds of jars produced in the United States Specification: Material: stainless steel Size: regular mouth Color: silver Quantity: 36 Package includes: 36 x regular mouth jar lids