This ruler is made from machined all-aluminum, so you don't have to worry about the corners getting worn down even if a cutter blade hits them. To prevent ink from smearing when drawing lines with water-based marker pens, the edge opposite the scale has a stepped design, lifting it slightly off the surface. ■ Size: 160 x 22 x 3mm ■ Material: Aluminum ■ Weight: Approximately 18g 【Please read before purchasing】 This product has small scratches and could not be sold as a regular product. Please check the photos and understand before purchasing.