The Pen-touch Ceramglass Medium White is a creative marker. Draw directly on glass, porcelain, enamel and ceramic. The Pentouch Ceramglass is available in 2 nib sizes and 8 colors. Shake the pen with the cap on for 10 seconds, then press down on the nib to start the ink flow. Store the Pen-touch Ceramglass horizontally and do not overpump.