Mars professional drafting scales are manufactured from specially selected materials to ensure dimensional stability and accuracy. They are durable, lightweight and have long lasting graduations. 12 inches long.

Architect scale includes 3/32, 3/16, 1/8, 1/4, 3/8, 1/2, 3/4, 1, 1 1/2, and 3.
Engineer scale includes 10, 20, 30, 40, 50 and 60.

Solid white plastic with color-coded grooves..