Item Type: Loose Leaf Binding Spine Material: Polypropylene Inner Diameter: Approx. 22mm/0.9in Type: Stationery Accessories Binding Consumables 1?��22mm 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.? 2?��10 Pieces in Set: The set contains 10 pieces this binding spines, allowing you to easily store paper and use for a long time.? 3?��Durable 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.? 4?��Good Performance: The binding strip surface is glossy, and has strong adhesion, not easy to break, can turn page smoothly, and can be used repeatedly.? 5?��Wide Usage: Binding strip can be manually bound by punching suitable holes, which can be easily operated by any office staff or student.