Features: Materials: Made of aluminum alloy. Compared to similar products, the ruler is therefore very comfortable in weight and has significantly less slip on the paper. Clear Scale: Markings on our professional aluminum triangular scale ruler are etched for perfect sharpness. These markings never go away, so you can always see each increment clearly. Versatile: Whether you are an architect, draftsman, engineer, teacher or student, the triangular scale ruler is a set of useful measuring tools for any project. No Sharp Edges: In contrast to other products, our metal scales ruler was developed with your safety in mind. Our aluminum triangular ruler has beveled edges, so no accidental scratches and cuts are caused. Two Sizes: S: 1:20, 1:25, 1:50, 1:75, 1:100, 1:125, L: 1:100, 1:200, 1:250, 1:300, 1:400, 1:500. Specifications: Type: Triangular Scale Ruler Material: Aluminum Alloy Color: Black Length: About 30cm/11.81inch S: 1:20, 1:25, 1:50, 1:75, 1:100, 1:125 L: 1:100, 1:200, 1:250, 1:300, 1:400, 1:500 Package Included: 1pc x Triangular Scale Ruler