The marbig insert binder range is manufactured from acid-Free, copy safe polypropylene which is glued to the board to eliminate crinkling and add strength and durability. Clear non-Glare overlay on front, back and spine to quickly and easily customise your file. Constructed from 100% recycled board and recyclable polypropylene. Handy pocket on inside cover. A4 available in 2, 3 or 4 rings and ring sizes 25, 38 and 50mm.