Anti Tarnish jewellery

Wondering what is anti tarnish jewellery. which are paper strips that you leave near metal items to help prevent them from tarnishing. For example, if you keep your jewellery in a jewellery box then you could put one in there, or if you sell your jewellery you could include one in the packaging. They are non-toxic, and last up to 6 months depending on the amount of exposure to the air. To use: Place paper in closed drawers, jewlery box, storage bag, silverware chest, instrument or trophy case.