The Cub Cadet Ultima Series ZT1 46 is a 46-inch zero-turn lawn mower with a 21.5 HP engine and an AeroForce fabricated deck. It is built to provide a high-quality cut with few clumps and an even finish. Key Features The Cub Cadet Ultima Series ZT1 46 is a 46-inch zero-turn lawn mower with a 21.5 HP