A wooden ruler that folds into 10 joints, each 20 cm long. At the end of each joint there is a metal plate attached to the last 2 cm on one side. The plate is cut so that the cm numbers are exposed at the joint, above which there is a similar metal plate without the values ​​being exposed. The two ends of the joints are connected with a rivet, which allows the entire joint to be rotated. The ruler is painted yellow; the numbers and scales are in black. Made in Italy.