PRICE IS FOR ONE SET- compatible with Happy Panner Add extra pages for writing or storing images, planner sheets and accessories with these black notebook rings. The smooth discs prevent torn paper, and interchangeable rings let you remove, add or re-arrange pages to organize information quickly or customize personal planners and journals. The 1-inch expansion of these Staples notebook rings contains 60 sheets and provides extra space as needed without switching notebooks. Notebook expansion disc allows you to add, remove and replace pages easily; the expansion disc is interchangeable to create more storage space Disk dimension: 1" Comes in a sleek black design 12 expansion disks per pack BE2