Plastic coil binding are an excellent alternative to other binding methods which might be too expensive or slow. With a plastic coil binder, your documents can be bound and ready in just s-econds. Plastic coil binders work by punching the document prior to inserting a strong, flexible, coil. The coil is spun, or threaded, into the document along its punched seam. These binders a-re perfect for large and small companies that want a quick and easy way to bind numerous do-cuments while maintaining presentation quality. Plastic coil bound material opens completely and lays flat. Excellent as presentation material when hands-free reading is desired.According to different diameters.Colors available: white, black, red, blue, green, yellowThe length of this product is 900mm.Of course ,you can call for specialized length. Pack1.For finished products: bulk pack. 2.You can call for specialized pack.