Features: WHAT IN THE PACKAGE: The package includes 100pcs binder rings, the quantity is enough for your needs. They are made of metal, strong and durable, not easy to break. The nickel-plated surface is not easy to rust, smooth, and will not scratch your hands when you open it. SIZE INFORMATION: The outer diameter of the binder is 2.5cm/1inch, the inner diameter is 2cm/0.79inch and the wire diameter is 0.22cm/0.09inch. Each binder ring can hold up 100 sheets A4 paper. EASY TO USE: Simply misalign it and pull to open. There is misalignment after opening, because the binder ring itself does not use springs or other elastic devices, in order to make the bite tighter after closing, so this design is adopted. WIDE APPLICATION: Book rings can be used to bind documents, great for loose-leaf books, memo filing, scrapbooking, making craft journals, photos, DIY projects, sample books, contracts or documents, and more, can also be used as a key ring. MORE TIPS: Our book rings are a great way to keep your classroom, office, or home more organized. But because of the small size of this loose-leaf ring, children should be accompanied by an adult to prevent swallowing and pinching. Specifications: Material: Metal Color: Silver Outer diameter: (Approx) 2.5cm/1inch Inner diameter: (Approx) 2cm/0.79inch Wire diameter: (Approx) 0.22cm/0.09inch Package Included:100pcs x Binder Rings Note:1. Due to the light and screen difference, the item's color may be slightly different from the pictures.2. Please allow 0.5-2 cm differences due to manual measurement.