The Staedtler Non-permanent Universal Map Marker can be used to write on most surfaces, including overhead projector sheets. This water-soluable ink can be easily wiped away by simply using a damp cloth. For left handers, the ink dries fast to avoid smudges. A PP barrel and cap keep the tip of the pen covered to extend the life. The line width is roughly 0.4 mm, meaning this is a superfine pointed pen that can write in small spaces. Order this refillable universal pen today!