Product size about :As shown in the figure Product color: As shown in the figure Product material:anodized aluminum alloy [PREMIUM QUALITY] This engineering triangle scale is made of anodized aluminum alloy, very solid and sturdy. Designed for maximum durability, this 3 sided metal architect ruler is perfect for lasting use [PRECISE IMPERIAL SCALE] The aluminum triangle ruler is professional grade with accuracy. With reliable construction and accurate performance, the black construction ruler is ideal for architects, engineers, draftsmen and students [ETCHED TECHNOLOGY] All numbers and measurement markings on drafting scale rulers are etched for maximum clarity and readability. Etched technology effectively prevents scale numbers and markings from wearing off or fading away  -AFTER-SALES SUPPORT: If you have any questions or concerns about our products, please feel free to contact us. We will be happy to serve you and ensure your satisfaction. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only. Package Included: 1 pcs ruler