Silver Keeper (18-inch by 18-inch) Zippered Holloware Bag made from silversmiths' cloth that contains R-22, a tarnish preventative that protects polished sterling and silver-plate from tarnishing by neutralizing airborne sulfur (the cause of tarnish) for years. Holds a 16-inch center piece or round tray, wine cooler, soup tureen, or a 12-inch bowl.