Protect your jewelry and precious metals from the gases that create tarnish and corrosion. Non-toxic Intercept(R) Tarnish Prevention Bags are made from a unique polymer that contains no oils, charcoals, or volatile chemicals. Prevents tarnish of items made from gold, silver, copper-based alloys, and ferrous metals. Environmentally friendly and fully recyclable, they are safe for all ferrous and non-ferrous metals. Provided in packages of 10 zip-lock, copper-colored bags.