The FriXion line of pens write smoothly and erase cleanly so you can erase every ‘oops’ (the written ones, at least). FriXion offers you unlimited do-overs so you can write, erase, and re-write until you get it right, without any wear or tear to the paper or messy eraser crumbs. The heat generated by erasing friction causes our unique thermo-sensitive gel ink to become clear so the words disappear completely from the page. Mistakes are a thing of the past with FriXion. Now nobody needs to know it wasn’t perfect the first time! These pens are perfect for marking sewing and quilting lines, as they will disappear with the touch of an iron. Please test pen on fabric before using on your project.