I was wailing away on a big old walnut round today. You know that mode you get in where it's you vs. whatever the inanimate object is, and you absolutely refuse to lose? That was me. I was really surprised this happened to be honest. It seems like really thick tubing. I can't imagine what it would have done to a plastic Fiskars. You may have won this "round" but I'll have the last laugh when you're burning in my fireplace.