Alumicolor Calibrated Triangles are made of tempered aluminum. Photo anodized calibrations are a part of the finish and resist cleaning or rubbing off. Their ultra smooth finish won't mark your work surface. Calibrations are in inches and centimeters. Triangles have calibrations on the holes as well. 2 piece set includes: 8" 45/90 and 10" 30/60/90 triangles.
