The description leaves out one important fact
Every description of frixion erasable pens never mentions one fact you need to know. Although they mark well and “disappear” when an iron is applied the ink is still there waiting to reappear when subjected to cold. When I read this fact I had used these pens on 3 very large quilts for my triplet grand daughters. I tested a piece of fabric in the freezer and refrigerator for about 10 seconds. And there they were, the gel pen marks! The girls took home their new quilts in January and by the time they returned home multiple lines were visible. There needs to be a disclaimer on the package and in the product description that alerts you to the fact that the markings will reappear when in contact with cold. Then the consumer can decide if they want to use the product where the marks can come back.