EPI Performance Heavy Duty Rear Suspension Spring Kawasaki Mule Pro FX / FXT / DX / DXT For those looking to enhance their ATV / UTV / Side-by-Side's performance, EPI Performance offers an upgraded spring rate solution. The high-quality chrome silicon springs are 25 heavier compared to OE stock springs, a feature that makes them perfect for supporting additional accessory weight. Features: Sold each 25 heavier than stock High quality chrome silicon Ideal for use with accessories that add weight (ex. plow, winch, cab, trailer etc.) Spring rate: 375