Check the listing for details. 5.25 Double Sided FLIPPY disk--Extremely Rare Retro Media! Read description!. Listed at 19.95 USD. 10 Double sided 5.25 flippy disks. Not regular floppy disks, but the very rare "flippy". They are not notched, so send us a message if you want them notched. As described in Wikipieda... A flippy disk (sometimes known as a "flippy") is a double-sided 5+1⁄4-inch floppy disk, specially modified so that the two sides can be used independently (but not simultaneously) in single-sided drives. Many commercial publishers of computer software (mainly, relatively small programs like arcade games that could fit on a single-sided floppy disk) distributed their products on flippy disks formatted for two different brands of computer, e.g. TRS-80 on one side and Apple on the other. Compute! published an article on the topic in March 1981. Sieg, M. G. (March 1981). "Flipping Your Disk". Compute!. p. 71. Retrieved 2013-10-26.