I too, use cheap chinese blades, I cut a lot of HTV glitter vinyl, clean cut blades just do not last. I don't know if they are to hard or what, or the tips break off, but I quit using them years ago, I've spoken with Ross (the owner of CC) before about them, but he has no good answer, he swears that "everybody" uses them. I used to get some good cheap ones from my vinyl supplier but he quit carrying them, he reason was he wanted to use suppliers from the USofA. But when I mentioned where all the Glitter comes from he didn't have to much to say, as most of it is made in Korea. We were his biggest customer, but still wouldn't get them for us.