ACU-ARC Adjustable Curve for Drawing (36 in. L) Still manufactured by hand, these curves have been used by architects, engineers, chiropractors, designers, draftsmen, artists, woodworkers, metal workers, surveyors, carpet installers, and law enforcement for 45 years. One edge is flat to surface for pencil, and the other side has a bead for ruling pen. Dimensions: 38"Lx2"Wx1"H. Country of Origin: US. Weight: 0.38lbs.