M&G A4 Display Book 0.6MM PP 20 Pockets is made  of premium Polypropylene (PP) which is used in a wide variety of applications. It is lightweight, does not absorb water, waterproof and easy to clean. 100 micron pages are acid free, smooth, glass clear and copy safe. The folder is soft and flexible with all the pockets held with a spine welded to the cover.