CNC-machined aluminum back surprise human body for XB8 Zero Rebound Shocks, produced from premium lightweight 7075 T6 aluminum. The special design of the surprise body and upper limit enables installing a ribbed shock membrane layer on the top of this surprise human body in place of old-fashioned installation to the top limit. The installation of the ribbed membrane layer regarding surprise body permits extra oil to leak down, and alongside a shock limit vent opening and adjusting screw enables the adjustment of quantity of air (rebound) before desired zero rebound is accomplished. The oversized big-bore shocks feature 18.5mm O.D. surprise systems, externally threaded with a variable collar for fast & effortless spring preload adjustment. The surprise systems are coated in a titanium color. Group of 2.