This 12 pack of color embroidery touch-up pens are double ended, water-based pigment ink textile markers.The permanent markers are acid-free and will not wash out. One end of the marker has a tip for detailing (2.0 MM) and outlining and the other end is a flexible brush tip for more complete coverage. Great for t-Shirts, sweatshirts, aprons, sneakers, needle-point canvas, quilting and much more!