Band of composite molded surprise pistons only for two shock absorbers with six 1.3mm holes & two 1.1mm holes. Two-way movement shock pistons use alternative practices following the piston travels up or down. Utilising the synthetic valve arranged on piston, 2 holes are closed whenever piston travels upÂ… appropriate the piston travels down, the valve begins 2 extra holes slim oil flows through 8 holes generally speaking. This setup enables perfect landings from jumps, despite having a soft shock set-up. Manufactured from specially-formulated composite item to produce smooth action & durability. Well-proven molding procedure guarantees perfect piston roundness after manufacturing, which means that your pistons move totally in shock figures for identical shock action in nearly every four shocks.