Amazon.com : Kokuyo Smart Ring Binder, Up to 25 Sheets, A5, 20 Holes (Light Colors & 100 Sheets Papers) : Office Products
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Amazon.com : Kokuyo Campus Smart Ring Binder, Up to 25 Sheets, B5, 26 Holes, Japan Import, Transparent (RU-SP700T) : Round Ring Binders : Office Products