Alumicolor Series L2R 12-Inch Aluminum Scale (3136-1) 2R Architect Flat Scale Extruded aluminum with anodized calibrations that will not clean or rub off Ultra smooth edges create smooth clean lines when drawing Left to Right reading calibrations that are easier to read than traditional architect scales that Architect calibrations are 1/4 1/8 1/16 and 1/32 Color Silver