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Amazon.com : Spiral Binding Coils 7mm (9/32 x 36-inch) 4:1 [pk of 100] Neon Red (PMS 185 C) : Office Products
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Plastic Spiral Binding Backs, 21 Rings Diameter 19 mm, Size A4, Capacity 121-150 Sheets, Red, Pack of 100 : Amazon.co.uk: Stationery & Office Supplies
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Metal Single Spiral Binding Coil for Book Binding Supplies - China Wire Binding, Coil Binding | Made-in-China.com
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