The Cub Cadet® Ultima Series ZT1 42 42-in. 21.5 HP* Zero-Turn Lawn Mower is designed to deliver a premium cut with few clumps and stragglers, fine clippings and evenness. Dual hydrostatic transmissions engineered for quick ground speeds that leaves your yard with a professional-quality finish. A continuous tubular steel frame with fully e-coated corrosion defense system designed to help protect against wear and tear.