Set of composite molded shock pistons for two shock absorbers with eight 1.3mm holes & two 1.2mm holes. Two-way flow shock pistons work in various ways once the piston travels up or down. Utilising the synthetic valve arranged inside piston, 2 holes are closed when piston travels upÂ… appropriate the piston travels down, the valve begins 2 additional holes therefore the oil moves through 10 holes as a whole. This setup allows perfect landings from jumps, despite having a soft surprise set-up. Manufactured from specially-formulated composite material to make smooth action & durability. Well-proven molding procedure ensures perfect piston roundness after manufacturing, so your pistons move perfectly in the shock figures for identical surprise action in most four shocks.