Corrosion Intercept anti-tarnish zip-lock bags are perfect for items that require affordable long term storage solutions for any product that may tarnish.Protects items from tarnish for up to 3 years.Perfect for jewellery, sterling or silver plated flatware, coins and other precious metals.Provides effective tarnish & corrosion prevention for the following materials: Silver, Gold, Copper, Bronze, Tin, Brass, Magnesium, Ferrous Metals (Iron and Steel).State-of-the-art technology to protect your jewellery, silver, gold and other precious metals.Patented Intercept TechnologyTM Anti-tarnish Products are environmentally safe, non-toxic, non-abrasive and do not leave deposits on items they protect.InterceptTM does not contain charcoal, or volatile corrosion inhibitors, and is temperature and humidity independent.