The IS® 500Z is bar none the best value in its class! Featuring Ferris’ patented suspension technology the IS® 500Z will mow more lawn in less time. And to make you even more productive, several accessories are available for your mower. We dare you to find another mower that can compare to the affordability and reliability of the Ferris IS® 500Z. Model Engine Deck IS500ZB2444 24 gross HP Briggs & Stratton Professional Series™ * 44" IS500ZB2752 27 gross HP Briggs & Stratton Professional Series™ * 52" IS500ZB2761 27 gross HP Briggs & Stratton Professional Series™ * 61"