Alvin 271P plastic engineer's scale ruler. Pro-quality, triangular engineering scale is made from high-impact boxwood-color plastic with tapered edges. Hot foil stamped graduations and color-coded furrows. Graduated in 10, 20, 30, 40, 50, and 60 parts to the inch. Supplied in storage sleeve. Alvin triangular 12" engineering drafting scale is made in Germany.