Aluminium Rulers with Non-slip Pad These aluminium rulers are coated white and are provided with bold black numbers for good readability. They are 35 mm wide and rigid, not flexible. A rubber strip is embedded on the underside for excellent anti-slip properties. The edge opposite to the scale is 4 mm high and can be used as a cutting edge for cutting tools. 6 mm back from the cutting edge a 1 mm higher safety ridge prevents injury should the cutter happen to slip. Made by SHINWA.