Rotationally molded from cross-linked PE, MediaVault stores CDs, diskettes, and data cartridges, and meets 1 hr UL Class 125 fire rating. Fire-retardant soda ash will not leak from seamless, insulated double walls. Cover has molded-in hinge and threaded insert for adding security lock. Safe''s outer dimensions are 10 1/2 x 11 5/8 x 17 1/2 in.