Crafted for maximum versatility, our system of refills and accessories inspire organization. Scrapbook formats allow for total customization, while easy-load formats accommodate standard sizes ( e.g. 5"x7", 8.5"x11") for quicker assembly. Series P Refills are compatible with all standard 8.5" x 11" three-ring binders. 10 sheets per pack. Archival / Acid-Free.