The uni-ball Super ink marker pen is oil based and permanent on most surfaces. It is fade resistant, abrasion resistant, water resistant and will even resist bleach or acetone, making it one of the few markers available that is truly permanent. Performs brilliantly on fabric, paper, CDs/DVDs, in the home or in the garden. Ideal for industrial use, in warehouses, hospitals, factories, laboratories, shops, laundry facilities, kindergartens and schools. The ink remains stable even after washing in the washing machine at 90 degrees C. Line width: 0.9 mm black. The price is for a piece, commercial packaging is 12 pieces.