There are 3 different size rulers you will receive in the package, 6 inch/12 inch/ 18 inch with slip- cork backing. Our drawing rulers adopt clear inch and metric measurements printing, helping quickly measure and draw straight lines and precise markings is suitable for accurate measurement purposes. They can be used for measuring items and improving work efficiency. Made of high-quality Metal, the metal millimeter ruler is rust- and -, , and safe. Metal rulers are flexible enough to measure curved surfaces without breaking. The smooth and flat edges, with right angles on corners. The metal metric ruler with cork backing will prevent sliding and keep them stable in the proper place during use. These rulers can also effectively prevent ink from penetrating another . Besides, hanging holes easy for hanging, and convenient for storage and carry, not taking up any space. A practical measuring tool suitable for artists, designers, architects, engineers, student , architects, DIY, etc. The drafting and measuring tools are perfect for different occasions, such as in classrooms, schools, offices, and homes. Colour:silver Material:Metal + Cork Package Contents: 1 set x ruler Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.