I have used both the Olfa and Fiskars (cheaper) 45" pinking blades. In general, I found them to blunt more quickly, However, I haven't used them before washing the fabric to reduce fraying. While I can resharpen my regular blades, I haven't found a way to resharpen the pinking rotary blades. I find it simpler to snip a small triangle off the corners of my fabric before washing in order to prevent fraying.