The BALL 1440032000 Regular Mouth Jar Lids come in a set of 12 silver medium-sized lids designed for regular mouth jars. These metal lids feature a vacuum seal and are dishwasher and freezer safe, ensuring a spill-proof storage solution for your canning needs. The set includes 12 jar lids that have a diameter of 2.75 inches, providing a reliable and convenient option for preserving your homemade jams, pickles, and other goods.