The ArtBin medium organizer offers a safe place to store your precious metals. Tarnish-inhibiting additive is molded directly into the adjustable dividers and forms a protective layer around non-ferrous metals (metals that do not contain iron, such as gold, silver, copper and brass) for up to five years! Tough polypropylene and a secure, dual-latch closure gives a durable, water-tight seal and protects against oils, stains and most common chemicals. Designed with six fixed compartments and includes 12 removable dividers.