Denso 5304 Spark Plug

0.4 mm iridium center electrode: world's smallest diameter that maximizes firing potential
U-groove and taper cut ground electrode: provides faster spark flame growth and lessens heat quenching
DENSO patented 360 degree laser welding process: ensuring exceptional quality bond and structural strength with the iridium center electrode
DENSO patented 360 degree laser welding process: ensuring exceptional quality bond and structural strength with the iridium center electrode