This is a set of 23 MD discs. The manufacturers are SONY and TDK. They are considered unused, as they still have their original packaging. Please note that the playback condition has not been checked to preserve the unused state. Set Contents: ・TDK 80-minute: 9 discs ・SONY 74-minute: 7 discs ・SONY bianca 80-minute: 7 discs