The BALL Regular Mouth Lid & Band set includes 12 medium-sized silver lids and bands, made of durable aluminum, stainless steel, and metal materials. These stamped lids are rust-proof and feature an airtight seal for keeping food fresh. They are reusable, freezer-safe, and dishwasher-safe for added convenience. Each lid comes with a band for secure sealing, making them ideal for preserving jams, pickles, and other homemade goods.