This 10mm, 30-hole loose-leaf binder spine holds approximately 65 sheets of paper. Set of 10: This pack includes 10 binder spines for easy and long-term paper organization. Premium PP Plastic: Made from high-quality, non-toxic, durable, rust-proof, age-resistant, and sturdy PP plastic. Excellent Performance: The smooth surface ensures strong adhesion, prevents breakage, allows for smooth page turning, and enables repeated use. Easy Binding: Manually bind papers by punching appropriate holes; simple for office workers and students. Item Type: Loose-Leaf Binder Spine Material: PP Inner Diameter: Approx. 10mm/0.4in Number of Holes: 30 Holes Type: Office Supplies Binding Consumables Approximate Binding Capacity: 10mm 65 sheets Includes: 10 x Loose-Leaf Binder Spines Your satisfaction is our top priority. We're committed to providing excellent service. If you encounter any issues upon receiving your product, such as damage or incorrect quantity, please contact us immediately for the best solution!