Powered by Briggs & Stratton U.S. built 850 engine QPT® Technology - the ultimate in reduced noise and vibration technology ReadyStart® - Starting made easy! No Prime, No Choke, Smooth Pull-Start! Quad Blade Cutting System - 4 swing-back blades deliver a cleaner cut & improved catching in thick, wet grass! Ultimate Mulching Performance - Unique mulching blade-disc design generates air-circulation beneath the mower continually cutting the grass - creating a fine mulch!