ArtBin Zerust Anti-Tarnish Medium Box is a clear box with 6 fixed 6 1/2 x 1 1/2 inch compartments and an attached locking lid. Includes 12 dividers made with a patented tarnish inhibiting additive that emits an odorless, harmless vapor forming a protective layer around metal surfaces. Store and preserve non-ferrous metals, including Silver, Brass, Gold, and Copper. For additional dividers, use ArtBin Tarnish Inhibitor Dividers, sold separately. Measures approximately 11 3/4 x 1 3/4x 7 inch.