You can use a strop to sharpen the blades.
Lenox Utility Knife Blades — Bi-Metal, Gold Edge, Titanium Coating, Shatterproof, 4-Notch Design, Model# LEX20350

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- Shatterproof, bi-metal construction allows each gold utility blade to bend and flex without breaking
- High speed steel edge with titanium coating keeps blades cutting after others have quit
- Four notch design allows blade to extend further
- Bi-metal blades fit most standrad utility knives
- Cuts tough materials, including dry wall, insulation, flooring, roofing and more
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