Item Type: Loose Leaf Binding Spine_x000D_Material: Polypropylene_x000D_Inner Diameter: Approx. 22mm/0.9in_x000D_Type: Stationery Accessories Binding Consumables 122mm 30 Holes: This is 30 hole loose leaf paper binding strip with an inner diameter of 22mm, which can hold multiple sheets at one time. 210 Pieces in Set: The set contains 10 pieces this binding spines, allowing you to easily store paper and use for a long time. 3Durable PP Material: The binding spine is made of excellent PP plastic, there is no harmless, has good wear and rust resistant, anti aging, sturdy and durable. 4Good Performance: The binding strip surface is glossy, and has strong adhesion, not easy to break, can turn page smoothly, and can be used repeatedly. 5Wide Usage: Binding strip can be manually bound by punching suitable holes, which can be easily operated by any office staff or student.10 xLooseLeafBindingSpine