Tru-Flex II graduated flexible curves is a highly versatile drafting tool. The flexible curve easily shaped to hold any curve. The Tru Flex curves lightweight aluminum core holds shape firmly for accurate drawings. The curve is graduated in both inch and metric. The flexible curves inch graduations in 16ths and 32nds are color coded black for quick identification. Metric graduations in mm and cm are color coded red. The curve has inking edges for pen and marker use and flat edges on both sides for pencil drawing. Lead and phthalate free, Alvin Tru-Flex graduated flexible curves.