Exit shock technology comes from 15+ years of off-road and snowmobile racing experience to give you the ultimate in ride quality, which is easily serviced for years of reliable use. All EXIT Shocks come with our ride quality guarantee. If for any reason your not satisfied with the way they are performing. Just call us within the first 30 days of use. We will re spring, and re valve until you are satisfied, no charge. Exit Series X0 Rear Track Shocks are available in both piggyback and remote reservoir configurations. All aluminum parts are anodized for a durable long lasting finish. Exit Series X1 Rear Track Shocks are piggyback design that directly replaces your stock air shock. All X1 shocks come with an external compression adjuster, which allows the rider to fine tune the shock with the simple turn of a knob. All aluminum parts are anodized for a durable long lasting finish. Exit Series X2 Rear Track Shocks are available in both piggyback and remote reservoir configurations. All X2 shocks come with an external compression adjuster, and external rebound adjuster, which allows the rider to fine tune the shock with the simple turn of a knob. All aluminum parts are anodized for a durable long lasting finish.