Pair of composite molded surprise pistons for just two shock absorbers with six 1.4mm holes & two 1.1mm holes. Two-way movement shock pistons work with various ways as soon as the piston travels up or down. Because of the rubber valve set up on piston, 2 holes are closed when piston travels upÂ… proper the piston travels down, the valve begins 2 extra holes so your oil techniques through 8 holes as a whole. This setup enables perfect landings from jumps, despite having a soft shock set-up. Made out of specially-formulated composite material to deliver smooth action & durability. Well-proven molding process guarantees perfect piston roundness after manufacturing, so your pistons move completely inside the surprise bodies for identical surprise action in most four shocks.