I've had the problem of leaving a small piece of fabric uncut. Figured I had a bad blade. Used the other one in the package, the same problem. I've been using them any way only because I have 30 of the Harbor Freight Blades and I'm just hoping these were not good. Maybe they are making them with a nitch because all of us quilters bought them out. So right now, I'm not a big fan of them, but maybe when I open the next package I'll love them.