Biodegradable Project Folder incorporates an additive that allows them to biodegrade in landfills and leaves no toxic residue. Offers reduced glare in storing letter-size documents. Open two sides with thumb-cut front for easy access to documents. Unique corner design allows folders to expand to hold up to 100 pages. Project folder is made of heavyweight, archival-quality polypropylene. Meets the EPA definition of biodegradable.