Ferris SRSZ3 Soft Ride Stand-On Series Mower 72" Vanguard Big Block EFI OGS 37hpFerris SRSZ3 Soft Ride Stand On Series Mower 72" Vanguard Big Block EFI OGS 37hp Built to deliver superior traction and performance, the SRS Z3X raises the bar for stand on productivity. With all new 52, 61 and 72 deck options, the Z3X increases productivity without sacrificing the trusted Ferris cut quality. A pivoting front axle allows the Z3X to grip on steep inclines, meaning you can mow safer and more efficiently on even the most difficult yards.