【Length】30 cm, Material: plastic. Precision: Sharp gradations and precise markings for maximum accuracy make the scale ruler triangular professional; a perfect measuring tool for any architect, designer, engineer, teacher or student, made for your most demanding project needs. 【No sharp edges】High-quality made triangular scale made of plastic, strong and reliable, durable and reduces bending and warping; it is finely processed, smooth, without burrs and bevelled edges and does not hurt your hands; at the same time, the triangular scale has been specially designed for your safety. Different scales: you will receive 2 pieces scale triangular scale rulers, each six rulers: 1:20, 1:25, 1:50, 1:75, 1:100, 1:125/ 1:100, 1:200 1:250, 1:300, 1:400, 1:500. . Our customer service team is there for you every day of the year and will be happy to answer all your questions within 24 hours., Manufacturer: Roysmart