The FriXXion pen is perfect for drawing patterns on fabric. The ink disappears as soon as the ink is heated. The tip of the pen is 0.5 or 0.7 mm and has a ballpoint. With the pen, you can easily draw thin lines on the fabric that are clearly visible. And are you done with your stitches? You heat the fabric from 2-5 cm with an iron, and the ink disappears immediately!