The Special Black series of blades from Olfa emphasizes sharpness. They are sharper than typical utility knife blades, because the cutting edge is ground at a sharper angle. The added sharpness means they can cut through corrugated cardboard, plastics, and multiple sheets of paper without much force, but they will dull slightly faster than a standard utility knife blade. If you're cutting thicker or more rigid materials often, Olfa Special Black Blades are just right for you.
Olfa Special Black Blade Large Size Utility Knife Replacement Blades (25 Pack) LBB25K by Daitool
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Rotary cutter recommendation sewing discussion topic @ PatternReview.com
Rotary Cutter, 45mm Rty-Dx Ergonomic Design, This rolling Olfa razor blade is perfect for all of your sewing and quilting needs. Sharp enough to cut
OLFA Rotary Cutter, 45mm Rty-Dx Ergonomic Design
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