Mars drafting scales are manufactured from specially selected materials to ensure dimensional stability and accuracy. They are durable, lightweight and have long-lasting graduations. These extremely dependable drafting tools have especially long-lasting graduation imprints. The bevelled edges always guarantee best results, no matter whether you use technical pens, fineline pencils, or any other drawing instrument. Scales come in a white solid plastic, with die-engraved graduations and color-coded grooves. 12" or 300 mm, available in several inch and metric divisions.