Watch out! These blades are super sharp! Used this cutter to make paper garlands for a party, and had to cut hundreds of circles out of thick colored paper. At first the plastic shaft that holds the blades kept bending and breaking on me, but it turns out i was pushing way too hard when cutting. I ordered 2 sets of replacement blades just in case but once i got the hang of it i didn't bend another blade. The top does tend to unscrew after you cut a bunch of circles, but this was a pretty minor annoyance considering the time this thing saved me. Took only seconds per circle! Very worth it for big craft projects!