Had a lap quilt I was sewing, backed it with fleece, could not easily free motion, so I used my hehr? marker. I was pleansantly surprised it worked so well and I was able to quilt on top of the lines drawn. These were all straight lines drawn with a ruler, but it eliminated me using another way of marking and then contending with it not coming off as it should, just thought I would let everyone know, they do work and are cheap.