Item Type: Binding Coils Material: Polypropylene Inner Diameter: Approx. 15mm / 0.59in Application: Stationery accessories binding supplies 1、Can Be Used Repeatedly: Bright colors and good gloss. Good glossy appearance, strong adhesion, resistant to wear and tear, rust and corrosion, aging, not easy to break and fade, page turning, can be used repeatedly.  2、Easy to Carry: This binding coil is very easy to carry, you can carry it on your body anytime when you need it, and when you don't need it, it won't take up a lot of space when you store it.  3、Binding Method: You just need to punch the right holes can be bound manually or with instruments, very friendly to novices, not too difficult.  4、Polypropylene Material: This binding coils is made of polypropylene, durable and strong, allowing you to easily compile the paper, and can be used for a long time under normal operation.  5、Applicable Scenarios: Any office, student, or individual can easily operate it, and it is also very friendly to novices, so if you happen to have related needs, then this is the product for you.