The ultimate anti-tarnish protection for storing and shipping jewelry, silver and other precious metals. The same technology used by NASA, the British Royal Mint and Jewelry manufacturers worldwide is available through EURO for your finest jewelry and silver pieces. Features: Will not harm any metals or gemstones even when in contact with tab or strip. The inert material will not release corrosive gases like charcoal based products. Temperature and humidity independent. Safe and effective on all non-ferrous metals such as silver, brass, copper and bronze as well as ferrous metals (iron based). Non-toxic, recyclable and environmentally safe. Place clean dry jewelry in a box or pouch along with strip (covers up to 420 cubic inches). Protection will last up to 12 months.