Alvin 98/ENG black aluminum engineering scale ruler. High-quality black anodized aluminum engineer's drafting scales has a large profile, hollow core, and tapered edges. Printed white graduations and colored (red, green, yellow) inlaid furrows. Professional engineer scale includes nice plastic case; graduated in 10, 20, 30, 40, 50, and 60 parts to an inch. Durable, attractive 12" triangular scales are made in Italy.