Pilot Frixton pens are the best!. I use them for drawing quilt patterns. If I make an error on my drawing I just touch it with the point tip of my warm iron and it disappears and I can make another mark. People say cold cold brings the color back but since I don't keep my quilts in cold I don't worry. If you decided to try them, don't get the very fine, get the fine cause the very fine are too sharp and don't mark well.