Magnetic cartridge: 1 1/8 in x 3 1/4 in x 1 1/4 in
The record contains a banker box of 158 magnetic cartridges for the CDC 38503-1 Cartridge Storage Unit. Each catridge has a black release button at each end, which opens the cartridge to expose the tape. There are two numbers on each cartridge. One number consists of four characters and is stamped on the left side of the paper label, the other is five numbers long with a preceeding letter and is found on the right side of the label.