Made of plain white high grade molded plastic. Measurements are printed clearly on the plastic face. 3/32 1/8 3/16 1/4 3/8 1/2 3/4 1 1 1/2 3:1 1/16 in. Ruler Type: Triangular Scale Length: 12".KOH3272BC. 3272BC. Chartpak Chartpak Triangular Scale.