The drawing ruler is made by plastic, it can be used for a long time. In order to be portable stationery, we designed it specifically for convenience, it is easy to carry and storage. A highly portable multi-function stationer. Features -Color:Black -Material: Plastic -Size: Approx. 26.00X1.80X0.50cm / 10.22X0.71X0.20in - It is simple in design, but very practical in use, which brings great convenience to you. - It can be used to transfer subject matter onto your canvas or paper while keeping the proportions. - The transfer ratio is applicable to many fields, including art, architecture and engineering. - With this item, you don't have to worry about the circle being drawn. - This is a multi-function drawing ruler tool, precision gauge, and can be used in industry. Package list: 1 x Ruler 3 x Replacement Heads