This is PRO-MT 4x4 Replacement Pivot Ball Hardware. Do you need to replace your PRO-MT 4x4 Pivot Balls or Pivot Hardware? Then you came to the right place! This includes the same Hardened Steel Pivot Balls, Aluminum Pivot Set Screws and Delrin plastic parts that devour hits from all angels and that come standard on the PRO-MT 4x4.