This triangle scale is made of anodized aluminum alloy for strength and durability. The drak backround color makes the etched numbers and delineations easy to read. All of the markings on the scale are etched into the aluminum so the will not fade or rub off.
Durable laser etched scales Blue Architect Scale: 1-1/2", 1, 3/4", 3/8", 3/16", 3/32", 1/2" 1/4", 1/8", 3, 16 Parts to the Inch.
Black Engineer Scale: 1:10, 1:20, 1:30, 1:40, 1:50, and 1:60.