The ECHO 17 in. 25.4 cc Gas Straight-Shaft String Trimmer features a solid steel driveshaft, which limits weight and helps a cceleration. The 25.4 cc Power Boost Vortex engine provides Ample power to tackle tough jobs. This trimmer is also equipped with heavy-duty vibration-reduction mounts for comfort, and the bump automatic line advance system helps you continue trimming without downtime. The I-30 starter helps make it easy to fire up the trimmer.