The measurements of a recording's shell. The shell is defined as an integral, non-removable enclosure such as the cartridge or cassette, in contrast with an easily removable container such as a jewel box or sleeve.
Format as H x W x D, followed by an abbreviated unit of measure, e.g., in., cm. Use positive integers, rounding up. Height is the longest dimension of the object; width is the second longest; depth is the shortest.