Group of composite molded shock pistons for just two shock absorbers with six 1.3mm holes & two 1.1mm holes. Two-way flow surprise pistons work with alternative methods after the piston travels up or down. Utilising the plastic valve set up on piston, 2 holes are closed when piston travels upÂ… appropriate the piston travels down, the valve starts 2 extra holes and so the oil flows through 8 holes as a whole. This setup permits perfect landings from jumps, despite having a soft surprise set-up. Made of specially-formulated composite item to provide smooth action & durability. Well-proven molding procedure ensures perfect piston roundness after manufacturing, so that the pistons move completely in surprise figures for identical surprise action in almost every four shocks.