• Factory drilled 0.8mm holes
• Allows for a heavier shock oil
• More consistent handling
• Set of 4.
• Fits X4 & T4
PSS pistons with factory drilled 0.8mm holes (2 in each piston). Allows for a heavier shock oil to be used, for a more consistent handling. To be used with a PSS shock system for ULP shocks 308029 and SLP shocks 308039. Set of 4.