These wires are designed to work with LS1 LS2 LS3 LS6 LS7 LT1 LT4 needing 2000*F High Temp Ceramic 45 degree ends. Ton's Performance wires are built with a spiral wound alloy conductor with a high dielectric insulator, fiberglass braid, followed by a 8mm silicone jacket to protect against heat and tears. Ton's is one of very few companies that offers custom wires for many different applications in the aftermarket motorsports world.