Features 22mm Inner Diameter: This 30-hole loose leaf binding spine features a 22mm inner diameter, capable of securely holding multiple sheets at once. 10 Pieces in Set: Each set includes 10 durable plastic binding rings, providing ample supply for long-term use and paper storage convenience. Durable PP Material: Crafted from high-quality PP plastic, these binding spines are wear-resistant, rust-proof, and sturdy, ensuring long-lasting performance. Smooth Page Turning: With a glossy and strong adhesion, the binding spines offer smooth page turning and reusability, making them ideal for repetitive use. Versatile Usage: Suitable for manual binding by punching holes, these plastic binding rings are user-friendly and suitable for office staff or students. Specification: Item Type: Loose Leaf Binding Spine Material: Polypropylene Inner Diameter: Approx. 22mm/0.9in Type: Stationery Accessories Binding Consumables Package List: 10 x Loose Leaf Binding Spine Package List 10 x Loose Leaf Binding Spine