Biodegradable sheet protectors incorporate an additive that allows them to biodegrade in landfills and leave no toxic residue. Will not biodegrade in the home, office, warehouse or store shelf environment. Standard-weight sheet protectors are designed for letter-size document storage in standard three-ring binders. Top-loading design eliminates the need for hole punching. Acid-free, archival-quality polypropylene means print won't stick to sheet protectors. Sheet protectors meet the EPA definition of biodegradable.