◎TEAC CT90 INSTRUMENTATION TAPE HEAVY DUTY Quantity: 2 boxes of 10 rolls each (Total: 20 rolls) ※ All items are unused. The following is written on the back: THIS IS BACK SIDE. UNUSEABLE. ■Condition These items have been stored for a long time. They are unused in their original condition, but please note that they were not individually packaged. Recording has been confirmed with a separate packaged item. The back side appears to be unusable to increase durability. ※※※ In those days, tape was used as a recording medium for computer data. Software for MSX computers also remained. 20 rolls for mass release, will sell to those who need them. Computer Recording Media SAVE / LOAD MSX