Trust me, we were skeptical about this little tool as well. Our dear friend, Chotsie LeFevre, gave us one when we had stopped by to visit one day. She said that her friend and old neighbor, Grace, had made them and given her a bunch. Chotsie asked if we had ever used one and when we said we hadn't, she insisted that we take one to try it. I couldn't imagine that it could work as well as Chotsie insisted it did. It didn't - it was BETTER!!!! After using it, I contacted the crafter and asked if she would sell them to us. They have lived on our countertop since then. Customers get weepy on the rare occasion we run out. You can use ithem safely on all surfaces. We have them in a bunch of colors so just give us a few options and we'll choose one for you. This is one of our most favorite things we sell. I love that Grace makes them for us. She's a peach. You can wash them in the dishwasher and they last for years.