Light Racing JounceShocks are nitrogen-charged secondary shocks that essentially add additional compression damping and controlled rebound to your vehicle. The bottoming limit acts with a very fast rising rate. The top of the shock body is threaded to accept various mating pieces such as a steel cap that can be welded to a frame. They offer separately adjustable compression and rebound damping. The relatively slow rebound damping is designed to prevent the bumpstop from pushing back onto the suspension on rebound.