Expand writing space, update calendar or planning sheets with these black notebook expansion discs. The 1-inch expansion sleek interchangeable discs prevent torn or wrinkled paper. These Staples notebook expansion discs let you customize notebooks to add, remove or move pages and incorporate indexes and other accessories. 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