Length: 30 cm. Material: Plastic.Accuracy: Clear gradients and precise markings make the linear triangle scale with maximum accuracy; the perfect measuring tool for any architect, draftsman, engineer, teacher or student, made to meet your most demanding project needs.No sharp edges: The triangle scale is made of high-quality plastic, which is sturdy and reliable, durable, and reduces bending and deformation; it is finely crafted, smooth, without burrs and beveled edges, and will not hurt your hands; at the same time, the triangle scale is designed for your safety.Different scales: You will receive six triangle scale leaders: 1:20, 1:25, 1:50, 1:75, 1:100, 1:125.Guarantee: Our customer service team is at your service every day of the year and will be happy to answer all your questions within 24 hours.