On this, I have to agree. While the Harbor Freight blades were super at cutting fabric, they were doing incredible damage to my cutting mat. I finally switched to the Olfa titanium blades, and I love them. They are very sharp without tearing up my mat, they last longer, they go through layers of fabric easily, and I'm sticking with them. Now all I have to do is think about replacing my mat, all because I wanted to save a few bucks on blades. Live and learn!