Precision formed, ceramic rolling ball point gives smooth movement across fabrics without snagging or damaging the weave. The 0.8mm point gives a fine line that doesn't bleed and gives an even laydown of ink, right to the last drop. The ink is a pale blue and deepens after a few moments. Lines are easily removed with the Sewline Aqua Eraser or water. Do not iron marks. Wonderful for embroidery and marking on light coloured fabrics.