SONY DIGITAL MICRO TAPE NTC-90 and a cleaning tape NTC-10CL set! The NTC-90 is unopened and unused, but it has aged, so there are changes as shown in the photos. I no longer have the main unit, such as NT-1 or NT-2, so I cannot confirm whether it is in a usable state, but it is a rare item as the media is no longer manufactured. Also, the cleaning tape is thought to be even rarer. This tape was featured in a commercial that compared its size to a postage stamp, and it was also listed in the Guinness Book of World Records as the smallest mass-produced tape. Even if you don't have the main unit, how about it as a valuable collection or as a topic of conversation?