1、Multifunctional: This comb binding spine is multifunctional and allows you to bind documents quickly and easily with our binding coils and binding ridges, making your work look professional every time. 2、Excellent PP Material: This book binder spine is made of excellent quality PP material, which is sturdy and abrasion resistant, not easy to be damaged, and can withstand heavy use and provide reliable binding every time. 3、Good Compatibility: This binding comb has good compatibility for 9 holes B5 paper, 6 holes A5 paper, 6 holes A4 paper, 6 holes A6 paper, 6 holes A7 paper, and it is suitable for 10 holes, 20 holes, and 30 holes binding machines. 4、Easy To Use: This PP comb bindier spine is very simple to use, you can easily trim it with scissors to meet your ideal needs, and you can add or subtract refill paper as much as you like. 5、Wide Application: This comb binding ring has a wide range of applications and is perfect for teachers, students, professors and handcraft makers who need to bind reports, presentations and other documents. Item Type: Comb Binding Spine Material: PP Hole Spacing: Approx. 19mm / 0.75in Diameter: Approx. 16mm / 0.63in Number of Rings: 3 Rings Per Spine Length: Approx. 42mm / 1.65in Compatible Sizes: B5 9 Holes, A5 6 Holes, A4 6 Holes, A6 6 Holes, A7 6 Holes Use: Binding photo albums, desk calendars, journals, page organizers Maximum Binding Capacity: 120 Sheets of 70g Paper 50 x Comb Binding Spines