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KW-trio 12pcs DIY Disc Binding Ring T-type Mushroom Hole Loose Leaf Notebook Notepad Binder Fixing Disc Buckle 10mm/15mm/20mm/25mm for Travel Office Home School Students Features: Different ring sizes to suit different thicknesses. 10mm ring diameter can hold 30 sheets paper. With this binding ring, the paper can be combined at will, the inner page can be flipped, and can be increased or decreased at will. The mushroom hole ring can be used for A7, A6, A5, A4, B5 papers of various sizes, notebook can be folded at 360 degrees. It is also very tight and firm in use and will not fall easily. This is a good choice for everyday notebook binding. The use of this product may also require a mushroom hole puncher, it can punch paper and then bind the paper with these ring. The binding rings can be used with TO NOTE notebook, add sheets to your TO NOTE, very convenient to use. Perfect for students, office workers, travelers, designer, etc. Specifications: Color: Red/Blue/Yellow(optional) Ring Diameter: 10mm/15mm/20mm/25mm(optional) Material: ABS Quantity: 12pcs Mushroom Binding Ring Adapts to Thickness: 10mm can hold 30 sheets of paper 15mm can hold 50 sheets of paper 20mm can hold 80 sheets of paper 25mm can hold 100 sheets of paper (paper is A4 paper thickness) Package Size: 10mm: 12.8 * 5.2 * 0.7cm / 5.0 * 2.0 * 0.3in 15mm: 13.9 * 4.4 * 1.7cm / 5.5 * 1.7 * 0.7in 20mm: 14.4 * 5.0 * 2.2cm / 5.7 * 2.0 * 0.9in 25mm: 15.3 * 5.6 * 2.7cm / 6.0 * 2.2 * 1.1in Package Weight: 10mm: 9g / 0.3oz 15mm: 11g / 0.4oz 20mm: 15g / 0.5oz 25mm: 21g / 0.7oz Note: The TO NOTE Notebook and puncher are not included. Package List: 1 * Mushroom Binding Ring Set