I recently was in a LQS and noticed a different brand of rotary blades that were much cheaper than Olfa, I think $3. Not only did I give it a try, but because they were so cheap I bought two of them. I got a bargain on the blades, but it didn't even cut one layer of fabric nicely. I took a closer look and realized they are for cutting paper. I feel dumb that I bought two of them when I should have just got one to try. I'm now waiting for my harbor freight blades to be delivered.