WIDE COMPATIBILITY – Our ½, ¾, and 1-inch discs are compatible with popular discbound systems like Eleven Discs, Levenger Circa, Staples Arc, Office Depot TUL, Martha Stewart, Happy Planner, and other customizable disc bound systems, covers, and accessories. BULK QUANTITY SAVINGS – Contains 22 expansion discs, ideal for building two junior or letter-size discbound notebooks, offering great value for personal and professional use. DIMENSIONS – Features an inner diameter of 3/4 inch (0.75 inch) and an outer diameter of 0.94 inch (24mm). SHEET CAPACITY – Capable of holding 90 sheets of our heavyweight 32lb refill paper or 120 sheets of standard copy paper to suit your journaling, notetaking, scrapbooking, storage, or archival needs. HIGH-QUALITY MATERIAL – Constructed from premium, lightweight ABS plastic, offering durability and ease of use for everyday handling. Optimize your organization and enhance your custom notebook setup with Eleven Discs Black Plastic Expansion Discs. This versatile pack of 22 discs is essential for those crafting their own discbound systems, compatible with brands like Levenger Circa, Staples Arc, and more. These discs are engineered for reliability, enabling you to easily manage personal, academic, or professional notes. With their robust capacity and flexible compatibility, these discs are perfect for expanding your notebook to fit all your organizational needs.