The cutting edge help is that you put the vinyl strips on the bottom of the ruler at the appropriate place, then slide the ruler up to the fabric. It helps ensure that the ruler is where you want it. The creator, Marci Baker, also showed my group how to put one at the top edge, so you only have to check the bottom rule to make sure you are square on the fabric. She gave us each 2 strips, but I was using someone else's ruler and mine did not come home with me :cry: So now I need to order some.