•【Rustproof & Long-lasting】These metal binder rings with multi-layer nickel-plated finish are rustproof, strong and durable.It is laser polished to a smooth finish so it will not scratch the hand when opened. Each binder rings support opening for more than 10000 times.
•【Standard Size】The package includes 80 Pcs loose leaf binder rings. Outer diameter: 25mm (1 inch), inner diameter: 20mm (0.8 inch). Each binder ring can hold up 140 sheets loose leaf papers.
•【Easy To Open/Close】Easy to use. Hold ends of the opening with both hands, then push forward with one hand and backward with the other with a little force. The rings will firmly hold your flashcards or papers without loosening.