Features ABS Material These spiral binding coils are durable and sturdy, allowing you to easily assemble the paper and can be used for a long time under normal operation. EASY TO CARRY These spiral binding bobbins are very convenient to carry. You can wear it on your body at any time when you need it. When you don't need it, it does not take up much space during storage. Applicable scenes: any office, students and individuals can be operated easily. If you have appropriate requirements, this is the right thing for you. Binding method: punching the right holes can be manually or tied with instruments, very user-friendly for beginners, not too difficult. Colorful and shiny good: good exterior gloss, strong adhesion, wear resistance, rust corrosion resistance, aging resistance, not easy to break, fade, page turning, can be used repeatedly. Specification: Item Type:Spiral Bobbins Material: ABS Inner diameter: approx. 11 mm / 0.43 inches. Application: stationery accessories, binding accessories Package list: 20 x spiral binding spools. Package List 20 x Spiral Binding Coils