Active Off-Road Bumpstops provide off-road enthusiasts greater control over their vehicles' suspension travel. Using progressive-rate springs means that instead of a hard stop at the end of axle travel the axle energy will be absorbed when bottoming-out producing smooth, predictable and quiet axle engagement and disengagement. Unlike OEM bump stops, Active Off-Road Bumpstops are made from natural rubber. Just like our Timbren SES line, Active Off-Road Bumpstops carry a lifetime warranty and a satisfaction guarantee.