This is Echo's compact rear handle design - based on the proven CS-355T. Premium guide bar - tall profile with multi-rivet nose. Premium 91PXL chain - hardened, extended life cutters for longer chain life. Automatic, adjustable clutch-driven oiler-Reduces oil consumption. G-Force engine air Pre-Cleaner™-Reduces air filter maintenance. Top-mounted, tool-less access air filter - positioned away from dust and debris.