ZTrak Z950M With the M Series, we came up with machines that would please those customers with large fleets who demand efficiency. The Z950M features a long list of available options, including Mulch On Demand decks, dump-from-seat Material Collection System capability, 3-way adjustable suspension seats and easy-to-use diagnostics. 7-Iron™ PRO and Mulch On Demand™ Mower Decks Each Z950M mower can be paired with one of our 7-Iron PRO mower decks - available in 60 or 72-inch (152, 183-cm) widths, or a time-saving 60-inch Mulch On Demand deck. These decks are stamped from a single piece of 7-gauge steel, which means there are no welds or corners on the underside for clippings to collect and clump.