I invested in lots of Invisigrip for my rulers and, I have to say, I didn't really think it made much difference. I also have the sandpaper dots on some of them. Pretty much I just hold them down really steady, and I always wear my Fons & Porter cutting glove on my left hand, just in case. My mom cut herself with a rotary cutter once, and it was pretty awful. I would not want that to happen to me.