Hi Joyce, I cut my arm the very first day I used a rotary cutter. I bought the one that you have to retract the blade yourself......barely brushed it on my arm while moving my fabric ( I forgot to retract the blade) and cut myself. It worried me that I could forget that easily so I decided I needed a safer rotary cutter......went back to the store and bought the one that retracts when you let go of the hand grip!