Features EXCELLENT PP PLASTIC - Made of excellent PP plastic, not harmless, wear-resistant, anti-rust, anti-aging, sturdy and durable. Good performance: the surface of the binding strip is shiny, has strong adhesion, not easy to break, can turn the page smoothly, and can be used repeatedly. Simple Binding: the binding strip can be manually bound by punching suitable holes, which can be easily used by any office staff, student. 10mm 30 Holes: this is a 30 holes loose leaf paper binding back with an inner diameter of 10mm, which can hold about 65 sheets. 10 Pieces Set The kit includes 10 pieces of binders, allowing you to easily compile paper and store it for a long time. Specification: Item type: loose leaf binding Material: PP Inner diameter: approx. 10 mm/0.4 inches. Hole number: 30holes Type: Stationery Accessories Binding Consumables Number of pages that can be bound: 10 mm 65 sheets Package list: 10 x Loose Leaf Binding Spines Package List 10 x Loose Leaf Binding Spine