JKS Flex Connect sway bar end links are an alternative to traditional solid sway bar end links. Increased on road comfort and awesome off road performance in one bolt on. The design soaks up "head bobble" inducing bumps using specially tuned springs. They compress and extend to allow additional articulation without having to disconnect while still providing some body roll control. The optional Performance Spring Kit fine tunes the balance of body roll control vs articulation using 1 of the 3 replacement spring rates. The optional Performance Spring Kit includes tools and tuning instructions.