Isomars Armstrong & Metric Combo Set contains Armstrong Scale made of white plastic, 4 Side bevel,both Side Armstrong Marking Ratio : 1/8=1', 1/4"=1, 1"=1', 3"=1' 3/8"=1', 3/4"=1, 1.5"=1', 3"-1' Dimensions : 300 X 40 X 2.7mm Metric Scale is an oval metric scale made of white plastic, 4 Side bevel. Both Side Metric Marking Ratio: 1:10, 1:20, 1:50, 1:100, 1:1, 1:2, 1:2:5, 1:5. Size: 300 X 40 X 2.7mm