●The 291R and 290 coil shocks pack in many features found on higher end shocks. ●Equipped with a preload adjustable coil spring and rebound damping adjuster(291R only) the 291R and 290 also use a patented foam insert to keep the air and oil separate. ●Low cost does not mean low value. ●Exaform 291R and 290 rear shocks are the perfect enhancement to any value-oriented or entry level off road or youth bicycle.