Iridium Long-Life (SIP) DENSO's patented Iridium alloy is more durable than even Platinum, allowing the center electrode to be shrunk to only 0.7 mm in diameter. This produces a dramatic improvement in ignitability and spark plug life. DENSO's Iridium Long Life spark plug is standard equipment with a number of automakers including GM, Toyota, Honda, and Mitsubishi. Features: Fine-wire iridium center electrode Platinum ground electrode 360 degree laser-welded spark tipBenefits: Sustained spark performance over 100,000 miles Withstands higher pressures and temperatures Reduced spark plug wear and erosion