I used my woodchuck pen pro with a R2 radius carbide cutter, it produced nothing but ribbons. I took very light cuts, but found that I could move pretty quickly back and forth as I had the cutter angled down below the centerline of the blank, so there really was no danger from my perspective. I've cast my own blanks and had them chip out on me, but I could tell after the first few, very careful, passes that these blanks would turn easily. I always feel like I'm cheating when I use one of the carbide cutter tools, like I didn't fully learn the art of a skew or gouge, but in this case I'm just a happy customer.