The Lufkin 6 foot folding ruler is made of boxwood and is 25% thicker than competitive wood rules. It has black markings embedded in a white background protected by a clear abrasive-resistant coating. The strong lock joints eliminate end play and retain accuracy. The rulers end caps and strike plates are brass-plated. It is conveniently double numbered on both edges and both sides of the ruler. It is graduated in feet to 1/10 and 1/100 of an inch to the foot with regular outside markings in feet and inches to 1/16".