Ridgid 73370 Fiberglass Folding Rule The product is 73370 RULE, 1619F 6' FIBRGLAS IS The product use for construction rulers This product manufacture by Switzerland Precision Made of Flexible Heavy-Duty Fiberglass with Embedded, Easy-to-Read Boldface Figures and Graduation No. 1610 is Graduated on One Side in Millimeters with Red Markings Every 10cm Reverse Side Reads in Inches 6' in Length 5/8" in Width