The standard version of the STIHL ROLLOMATIC® Ematic™ bar consists of three electrically welded metal plates (laminated guide bars). The middle plate is hollowed out, giving the bar great stability with low weight. Ask your local dealer for assistance selecting the right guide bar for your chainsaw. Applications: All-around bar suitable for occasional, midrange or professional user. Note: The actual listed guide bar length can vary from the effective cutting length depending upon which powerhead it is installed.