According to the name JW-Z200, it appears to be a ribbon cartridge for this ancient Toshiba word processing system:
https://www.ebay.com/itm/133210851536
One of these cartridges can be seen in the third and second to last picture.
https://www.ebay.com/itm/133210851536
One of these cartridges can be seen in the third and second to last picture.