This 4600 Textile Pen is suitable for precise designs on many light-colored, chemically untreated fabrics such as cotton, silk and linen, as well as on a number of mixed fabrics. Add creative designs to t-shirts, fabric home décor or tote bags. Once you have drawn on the material, the applied ink can be made permanent by ironing once (without steam), the textiles can be washed at up to 140 degrees F (60 degrees C).Details:Available in assorted colors1 mm thick round nibWaterproof inkMake permanent by ironing (without steam)Use on light-colored, chemically untreated fabrics