The saw chain is generally composed of four parts, including the cutter head, middle guide teeth, connecting pieces and rivets. The cutter head is divided into the left and right cutter head, and the connecting piece is divided into the left and right connecting piece. Some saw chains in order to reduce the cutting rebound will have some buffer design, these parts with buffer characteristics include buffer guide teeth, buffer connecting pieces and so on. Saw chains are generally distinguished between professional and non-professional, based on their Kickback Angle during the cutting process. Professional chainsaws rebound larger, suitable for professional logging operations or other frequent use of chain saws. Non-professional chainsaw bounces less, suitable for home use.