This colorful Wooden Ruler collection by Hay brings back memories of my school years. The centimeters and millimeters are represented as wide stripes and narrow lines, which form graphic patterns. Made of beech wood.
Wooden Rulers, $9.75 (set of three)
Available in six different color combinations.
moddea 
Nice.
Beech, just like the wooden design and drawing tools that I used for 40 years as well as the classic Stanley folding carpenter’s rule.