These Nickel TT plugs are the first spark plugs with thin electrodes made without the use of precious metals. They have a nickel center and ground electrodes with a diameter of 1.5 mm, which is smaller than Nickel plugs. Thanks to this feature, DENSO Nickel TT Plugs demonstrate higher spark power and provide more effective ignition of the air-fuel mixture. In terms of ignition parameters, Nickel TT plugs are equal to platinum plugs and allow a reduction in fuel consumption. This is achieved through complete combustion of the mixture in the cylinder while engine performance is improved.