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Amazon.com: HEIKIO Utility Knife Blades, Pack of 10 Standard Replacement Blades for Heavy Duty Utility Knives and Box Cutters, Made of Black Carbon Steel, Thicker and Sharper than Normal Silver Blades :
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SkimFlex knife blades Black Tiger Blades - 10 x Extreme Ultra-Sharp & Long-Lasting for Utility Knives
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