DENSO FK16HR-A8 Iridium Long Life Spark Plug 3484-4 Pack

• 100% pre-fired for reliable operation. • Excellent thermal conductivity with copper core center electrode. • Unique 5-rib insulator reduces flashover and reduces voltage loss. • Dual copper and glass seals join the center electrode and insulator for a gas-tight seal. • Lasts 3 times longer than traditional plugs.

Using the same laser welding process as the Iridium Power Spark Plug, DENSO has designed a long-life spark plug factory installed by automakers such as GM, Toyota, Honda, and Mitsubishi.Using a patented iridium alloy, DENSO has reduced the center electrode to 0.7mm, greatly improving ignitability and longevity.