Acid-free refill cartridge is 50-feet long and fits into a Xyron 850 machine. Laminates one side and applies an even layer of edge-to-edge adhesive on the other. The 850 by Xyron works with out batteries, heat or electricity, so it is quick and easy to use. Other refill cartridges available include dual lamination, permanent adhesive and acid-free repositionable adhesive.