1 Storage Unit (White) Holds 22 game cartridges for Game Boy, Game Boy Color, and Game Boy Advance. This is an inner case designed to fit the Muji case. It's made to fit the polypropylene storage case wide, but there may be a few millimeters of space depending on the size (small, medium, or large). GB cartridges will not fit in the medium or large sizes. Separate design allows for customizable arrangement. Also Gridfinity compatible. Size (approx.): Width 63 x Height 231 x Depth 27 (mm) - Anonymous delivery - Please comment if you have any questions. This is a handmade item made with a 3D printer, so please understand.