- 2 rings A-919 makes document storage orderly, beautiful and save space. - The cover is made from cardboard. Covered with high quality PVC plastic, durable, waterproof and scratched. - 2 metal clip lock, strong, not rust, firmly locked, can support document weight very well. - Have a plastic file to write the name or topic of work to separate the categories Search, take, easy to use - lightweight, portable, suitable for A4 size documents - 3 pcs / pack