Specially treated 5" x 7" cloth removes tarnish and re-applies anti-tarnish protection to un-plated sterling silver. Designed for sterling silver's natural composition (92.5% pure silver, 7.5% alloys for durability). Compact and easy to use for quick polishing without harsh chemicals. Avoid getting the cloth wet or washing it, as this will remove the anti-tarnish treatment. Over time, the cloth may blacken—this is normal and indicates the tarnish is being removed. Replace the cloth when it begins to tear. Avoid gemstones, Sparkle products, or other non-metal components.