Artverum Chalk Marker 50. Have you ever quickly jotted down a note on the magnetic board and been frustrated that the felt tip loses its writing power? More smudges than a thick, clearly visible line? Then it's time to switch: Sigel has designed this special marker for its eponymous glass magnetic board. The liquid chalk provides a consistently uniform writing appearance on the glass surface and can be easily wiped off despite its high opacity. Developed as a non-permanent solution, the writing can be removed without residue, both wet and dry. Sigel recommends storing the pen tightly closed, either horizontally or with the tip facing down. The Artverum Chalk Marker 50 from Sigel features a slanted chisel tip with a variable line thickness (1-5 mm) as desired.