Perfect for presentations, art works, blueprints and other important documents, these acid free protective sleeve refills are great for large projects or for expanding your portfolio. Available in your choice of sizes, the sleeves feature universal holes for storage in presentation cases or binders. Universal holes allow use in all presentation cases. Holes located along long edge. Also fits standard 3-ring binders. Archival quality, acid-free polypropylene material with acid-free black paper inserts.