Solid white plastic.
Mars Triangular Student Drafting Scales architect scale Architect scale includes 3/32, 3/16, 1/8, 1/4, 3/8, 1/2, 3/4, 1, 1 1/2, and 3. Mars student drafting scales are manufactured from specially selected materials to ensure dimensional stability and accuracy.Engineer scale includes 10, 20, 30, 40, 50 and 60. 12 inches long.