Item Type: Spiral Binding Coils_x000D_Material: ABS_x000D_Inner Diameter: Approx. 11mm / 0.43in_x000D_Application: Stationery accessories binding supplies 1ABS Material: This spiral binding coils is durable and strong, allowing you to easily compile the paper, and can be used for a long time under normal operation. 2Colorful and Glossy Good: Good exterior gloss, strong adhesion, wear resistance, rust corrosion resistance, aging resistance, not easy to break fade, page turning, can be used repeatedly. 3Easy to Carry: This spiral binding coils is very convenient to carry, you can carry it on your body at any time when you need it, when you do not need it, it will not take up a lot of space when stored. 4Binding Method: Punching the right holes can be bound manually or with instruments, very friendly to novices, not too difficult. 5Applicable Scenes: Any office, students, individuals can easily operate, if you happen to have related needs, then this one is for you.20 x SpiralBindingCoils