Check the listing for details. Rare Alvin 241B Engineer Scale 12in Triangular Drafting Ruler Solid Bamboo Japan. Color: White, Condition: New. Listed at 23.95 USD. Alvin 241B Professional Engineer Scale 12" Triangular Drafting Ruler, Solid Bamboo, 10 20 30 40 50 60 Graduations, Made in Japan FeaturesProfessional quality scale with heavy duty solid bamboo core.White high impact plastic laminated faces and tapered edges.Machine engraved divisions and color coded furrows.Engineering scale with 1/10 1/20 1/30 1/40 1/50 1/60 fractions.Comes in clear hard plastic case. Made in Japan. The Alvin 240B Series Bamboo Engineer Triangular Scale is an ideal drawing and measuring tool. It features a bamboo core with white laminated high-impact plastic faces. It has color-coded furrows to easily identify the scales. To ensure accuracy and precision, it has tapered edges and machine-engraved graduations. This bamboo engineer triangular scale is equipped with graduations including 10, 20, 30, 40, 50, and 60 parts to the inch. It is double numbered. The Alvin 240B Series Bamboo Engineer Triangular Scale is 12 inches in length. It is packed in a hard plastic case. SpecificationsBrand: AlvinPart Number: 241BType: Engineer Drafting ScaleLength: 12 inchesGraduations Used: 10, 20, 30, 40, 50, 60 parts to the inchColor: White