The Ball Wide Mouth Mason Jar Lids come in a set of 12 boxes, with each box containing 12 lids for a total of 144 flats/lids. These BPA-free lids are made in the USA and feature a vacuum seal for better preservation. The silver-colored lids are durable, made of aluminum and stainless steel, and designed for canning purposes. This custom bundle from the trusted brand Ball is a must-have for any home canning enthusiast looking for high-quality, USA-made lids for their wide mouth mason jars.