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Denso manufacturers the following iridium series:
Denso's Iridium TT Series is Denso's latest addition to revolutionary Twin-Tip technology. Featuring the world's thinnest Iridium center electrode at 0.4mm and 0.7mm Platinum fine wire ground, Twin-Tip technology enables larger spark concentration, resulting in more complete combustion and greater fuel economy. Tested to last well beyond 100,000 miles.
Denso's Iridium Power Series feature the world's thinnest center electrode at 0.4mm, made with iridium-alloy and a taper-cut, u-groove ground electrode.
Denso's Iridium Racing Series improves on the Iridium Power Series with a 0.8mm platinum alloy ground electrode and a strengthened insulator.
Denso's Iridium Tough Series features the same 0.4mm iridium alloy center electrode, but includes a platinum tipped ground electrode.
Denso's Iridium Plus Series is identical to the Iridium Tough Plug, but includes a high strength insulator for LPG engines.
The Iridium Power and Iridium Racing Series are available in the US. Denso's Iridium Tough and Iridium Plus Series are not available from Denso in the US at this time. Denso's Long-Life Iridium Plug is very similar to the Iridium Tough Series with a 0.7mm iridium tipped center electrode and a platinum tipped ground electrode. The Long-Life Iridium plugs are available in the US, and come factory installed on many luxury vehicles.
The SparkPlugs.com family has imported some Denso Iridium Tough and Iridium Plus plugs that have demand in the US.