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16mm Plastic Spiral Binding Coils - 4:1 pitch Black (Box of 100) | eBay
30 Hole Loose-leaf Plastic Binding Ring Spring Spiral Rings for A4 A5 A6 Paper] | eBay
Spiral Binding Coils 4:1 Pitch - A4 White Black Clear 6mm 8mm 10mm 12mm | eBay