Autolite 4164 Copper Resistor Spark Plug<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Full copper core electrode with necked down tip for improved ignitibility provides better performance in all conditions</li><li>Cold-formed steel shell and precision rolled threads， with anti-corrosive nickel plated shell</li><li>Gas-tight seal (100 percent leak-proof) and reduced RFI (radio frequency interference)</li><li>One-piece terminal post for added strength and multi-rib insulator reduces danger of "flash-over"</li><li>Copper-glass， resistive seal bonds insulator， terminal post， and center electrode together ensures full required voltage at spark gap</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31g6HiBtjcL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/510cMIArABL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51eYrQmAz-L.jpg" noproxy>