Features: Useful tools: Binding spine is an ideal choice for daily life, which provide a professional solution for your school subject, handbook, office reports and more. Warm to share: You can share our wire binding spines with your family, friends, coworkers, teachers or others who need them, they will be so glad to get these practical tools, to promote your relationship. Specifications: Material: metal Color: black, white, rose gold and silver Size: 7/16 inches,1/2 inches, 9/16 inches, 5/8 inches and 1 inch in diameter Package includes: 100 x Double loop wire bindings Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays.