calvin' colour: Transparent color Material: plastic size:450mm Package Contents: 1*Chart parallel ruler Only the above package content, other products are not included. Note: Light shooting 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.

• Product Dimensions ‏ : ‎ 22.83 x 5.91 x 1.18 inches; 1.5 Pounds
• Date First Available ‏ : ‎ June 17, 2019
• Manufacturer ‏ : ‎ Advance.Man Engineering Instruments