1. carbon steel ruler body, anti-corrosion, no rust. 2. High precision laser engraved scales, clear, wear-resistant and no fading. 3. The edges and corners of the ruler have been carefully polished, which does not hurt the hands. 4. The ruler has been chrome plated to improve its wear resistance. 5. The rotating design of the straight ruler makes the ruler more flexible in use. Specifications: Surface treatment: chrome plating size: 80 x 120mm Material: Carbon steel colour: Silver Package Contents: 1 x Protractors Only the above package content, other products are not included. Note: Light reflection 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.