Features: 1. Light, not easy to break, not easy to deform, smooth lines 2. The scale is clear and accurate, with built-in scale, easy to carry 3. Triple precision drawing, multi-functional, convenient for your life 4. Printed numbers with high color contrast and easy to read Specifications: Purpose: ideal tools for engineers, technical drawings and architects Small scale: 1:20 / 1:25 / 1:50 / 1:75 / 1:100 / 1:150 Large scale: 1:100 / 1:200 / 1:250 / 1:300 / 1:400 / 1:500 Material: aluminum alloy Size: 321 * 20 * 20mm/12.64*0.79*0.79" Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow 1-3cm measuring deviation due to manual measurement. Included: 1 X Scale Ruler