Pakon Plastic Slide Sleeving. 8.9lb roll. I believe this is used to hold mounted photo slides, each pocket measures 50mm x 50mm. I can only guess it holds hundreds or a thousand slides(?)
These may be a bit dusty from 20+ years in storage. There might be some yellowing.
A portion of the box says Pakon P/N 300-101. I can not find any information or specs online.
Condition: New old stock. Might be dusty/dirty and yellowing. Photos are representative, I have a number for sale.
