Professional Metric 12" 30cm Triangular Scale Ruler 1:100, 1:200, 1: 250, 1:300,1:400, 1:500 Colored Groove Etched / Notched Markings Compare to Staedtler and Helix - ours have notched grooves - NOT just printed on. Expect to pay $20+ anywhere else for quality like this. Triangular Scale Ruler;Type : 1:100, 1:200, 1:250, 1:300, 1:400, 1:500 Red Green and Black colored grooves, Made in GERMANY