Refill pages are designed for use with Cardinal EasyOpen Card File Binder and other letter-size binders. Each letter-size page holds 20 business cards front and back for a total of 200 cards in the 10 pages. Poly material will not stick to cards. Archival-safe material will not lift or transfer inks or toners. Pages are seven-hole punched to fit in three-ring and seven-ring binders.