Staples 3-by-5-inch spiral-bound neon index card notebooks, two books per pack These ruled spiral-bound index card notebooks are perforated for a clean tear-out, are acid-free and contain 10 percent post-consumer recycled content. Bound index cards are a great way to easily organize information for students or speakers. They are sold in a pack of two books with 50 cards per book. 3" x 5". Neon. 2. Line ruled format for list taking and organizing. Cards are in assorted neon colors for quick filing and retrieving. Staples brand 100% satisfaction guarantee.