The Belltech Trail Performance lift shock lineup has been engineered to provide a premium ride quality for today's trucks and SUV's. Our engineers focused their attention on tuning the low speed compression characteristics of this shock absorber, which is responsible for controlling your Sport Truck or SUV's pitch and roll, dive and squat to help keep you confident and in control. The "Progressive"rebound tuning will complement large aggressive offroad tires, keeping the ride smooth but firm and in control.