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Rayson Plastic Binding Combs, 20 Sheet Capacity, 6mm, Colourful Comb Binder Spines, 21 Ring, A4, Box of 100 : Amazon.co.uk: Stationery & Office Supplies
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50 Pack Spiral Binding Coil, Plastic Comb Binding Spines for Book Binding, 11 x 1.5 inch, 38mm - Walmart.com
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