Number of composite molded surprise pistons for 2 shock absorbers with eight 1.3mm holes & two 1.2mm holes. Two-way movement surprise pistons assist different ways following the piston travels up or down. Using the synthetic valve arranged inside piston, 2 holes are closed whenever piston travels upÂ… appropriate the piston travels down, the valve begins 2 additional holes slim oil techniques through 10 holes in general. This setup allows perfect landings from jumps, despite having a soft surprise set-up. Made of specially-formulated composite item in order to make smooth action & durability. Well-proven molding procedure guarantees perfect piston roundness after production, therefore your pistons move completely in shock figures for identical shock action in many four shocks.