Features PP Material These binding spools are made of PP material, durable and strong, allowing you to easily compile the paper, and can be used for a long time in normal operation. Binding method: you just need to drill the right holes to be connected manually or with instruments, very friendly for novice, not too difficult. Applicable scenarios: Any office, student or individual can easily use it, and it is also very novice friendly, so if you have related needs, then this is the product for you. Can be used repeatedly, bright colors and good gloss. Good glossy appearance, strong adhesion, wear-resistant, rust and corrosion resistant, aging, not easy to break and fade, turn pages, can be used repeatedly. EASY TO CARRY This binding spool is very easy to carry, you can wear it on your body at any time when you need, and when you don't need it, it will not take up much space when you store it. Specification: Item Type: Binding Spools Material: polypropylene. Inner diameter: approx. 15mm / 0.59in Application: Stationery Accessory Binding Supplies Package list: 10 x link coils. Package List 10 x Binding Coils