There are three different types of ignition leads, copper core, resistive and reactive which differ based on the materials used for the conductor and the type of resistor required for interference suppression.
GENUINE NGK SILICONE BLUE IGNITION LEADS WIRES FIT MAZDA MX5 EUNOS MIATA 1989-06
NGK High Performance Ignition Coil Set 8 For Audi Porsche VW Petrol 06D905115
NGK U5014 48041 Ignition Coil
NGK U1062 48299 Ignition Coil
GENUINE NGK SILICONE BLUE IGNITION LEADS WIRES FIT MAZDA RX8 2003-2012 FULL SET
NGK U5017 48047 Ignition Coil
