The STIHL ROLLOMATIC® E Professional is a professional laminated guide bar made of high-grade steel. Consisting of three electrically welded metal plates, it is lightweight, yet provides great stability. The rails are induction hardened for wear resistance and long service life. A six-rivet sprocket is incorporated in the nose of the bar that carries the saw chain from the top to the bottom of the bar to reduce wear on the sprocket nose and provide a long service life.