This is Echo's pleated air filter with a large surface area to ensure steady flow of clean air to carburetor. Aluminum handle with rubber grip for strength and comfort. Decompression valve for easy starting, 3-point spring vibration reduction system for operator comfort. 19mm captive bar nuts – no chance of losing hardware, automatic, adjustable clutch-driven bar oiler operates only when the chain is moving to reduce oil consumption. Chrome plated cylinder for long engine life, antivibration handle, bumper spikes, chain brake, electronic ignition.