ATTENTION plastic storage case is sealed but I hear a rattle inside .... please take into consideration no returns The Radio Shack High Density Diskettes are 5 1/4" floppies with a capacity of 1.2 MB per disk. This pack includes 10 diskettes preformatted with MS-DOS. The diskettes come in a box packaging type and are manufactured in the United States by RadioShack. These high-density diskettes are ideal for storing and accessing data on older computer systems that use 5 1/4" floppy drives.