24K gold plated to commemorate O.S.'s 80TH anniversaryFor use in off-road RC vehicle engines with turbo type cylinder headdesign such as the O.S. .21VZ-B V-Spec and most .18-.28 off-roadengines with turbo cylinder headSuper hot heat range for smooth idle and fast accelerationTapered seat mates perfectly with cylinder head for a superior seal
P4 Gold High Performance Glow Plug