Band of composite molded surprise pistons just for two shock absorbers with six 1.3mm holes & two 1.1mm holes. Two-way movement surprise pistons work with alternate practices after 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 additional holes thin oil flows through 8 holes generally speaking. This setup enables perfect landings from jumps, despite having a soft surprise set-up. Made of specially-formulated composite product to supply smooth action & durability. Well-proven molding procedure guarantees perfect piston roundness after production, so your pistons move totally in shock numbers for identical shock action in almost every four shocks.