These will be getting harder and harder to locate. These are designed to be used in stand alone Hi-Fi consumer recorders. They seem to be usable in computer cdr drives too, but the fact that they will record in those out of production standalone units is what makes them scarce. They should play on all cd players after being finalized. 15 are original, but since one was missing I added a compatible disc from a different manufacturer to complete the pack. Please see pictures for cosmetic condition. Will ship carefully packaged by me, thank you.