These handy 1" tabs can be used with your jewelry in storage, or in transit, to keep your metal from tarnishing. Safe with silver, nickel, copper, bronze, brass, tin and gold. Lasts up to a year if kept in a sealed environment. Tabs conveniently change color when it's time to replace them.I keep my Jewelry in ziplocks with one of these in there. Or if it is a larger bag with multiple pieces of jewelry, I will throw 3 or 4 tabs in to keep my jewelry bright and shiny.