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50-100PCS/BOX A4 3:1 Pitch 34 rings 6.4-19.1mm Colorful OY double coil double loop wire binding wire combs binding rings - AliExpress
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Amazon.com : Binditek 100P Double Loop Wire Binding Spines, 1/2Inch Binding Wire for Letter Size, 3:1 Pitch, 100 Sheet Capacity, 32-Loop, Black : Office Products
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