These UHMW PE pivots are naturally lubricious and provide quicker response out of your front truck. Use them in the arm / for the upper pivot only.
 
Please note that the harder material does not last as long as the Riptide urethane pivots. It's recommended that you keep a spare or two on hand to swap out as they become degraded from use. 
 
Want to upgrade your Mk3 or Mk3.5 slalom front truck? Grab a Mk4 Arm that ships with one of these installed.