The platinum Twin-Tip plug raises the bar, with DENSO's special platinum alloy on the center electrode and a titanium-enhanced alloy on the ground electrode. The standing ground electrode reduces spark quenching, producing more effective ignition, while the durable alloys extend spark plug life. In DENSO's Platinum TT spark plug, the TT stands for Twin-Tip. It's one step beyond traditional platinum plugs, with premium materials on both electrodes instead of only one. The 1.1mm platinum center electrode is augmented by a titanium-enhanced ground electrode, delivering maximum ignition energy under the fiercest conditions an engine's combustion chamber can dish out. Product Features:1.1mm platinum center electrodeTitanium-enhanced alloy ground electrodeMinimum-quench electrode designImproved fuel economyFaster startsEnhanced flame propagation for increased engine efficiency Along with the materials, the design is unique as well: The ground electrode's free-standing firing pad reduces quenching to generate a more powerful spark. The Platinum TT is designed to offer superior consumer value, along with faster starts and improved economy. DENSO's objectives: Top Performance, Total Value.