Usage Tips:1.What you get:You receive 20 Pieces 3/4 inch Disc, Meet your work needs and help you classify documents.Easy to organize and store paper of all sizes.Bring you a good experience. 2.3/4 inch Disc:Each Expansion Discs has a 3/4 inch inner diameter and holds up to 90 sheets of 32 lb paper or 120 sheets of standard , easily organize your paper and say goodbye to clutter. 3.Plastic Discs:Each Expansion Discs is made of plastic material, with a smooth , and unbreakable,inner pages can be disassembled to that the pages are not jammed, you can easily increase or decrease the number of notebook pages. 4.Binder Rings:Expansion Discs are perfect for organizing your loose leaf, papers, , memos, documents, notebook pages, drawings and more, keeping them organized, customize your own notebook or planner with Expansion Discs. 5.Wide range of uses: 3/4 inch Disc is suitable for school, office or home use, can be used as an exquisite gift for students, teachers, leaders, designers, office workers, travelers, etc., small and easy to carry. size:1.9 x 1.9cm Material: plastic colour: Silver Package Contents: 20 x Binder Rings Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.