●For Your Paper: Designed to have 13mm inner diameter, the spiral binding coil enables smoother page turning for reading and writing. ●Better Binding: Easy to install and remove, you can also cut the binding comb into your preferred length for your needs of storage. ●Wide Application: Able to clip a large amount of sheets, the binding spine suits perfectly for office, classroom, library and so on. ●Great Material: The spiral binding coil is made of premium plastic material with pretty colour, not easy to deform and very durable and long use. ●20Pcs in Total: There are 20pcs spiral binding coil in the set, and the large quantity will simplify the replacement of damaged ones.