The ignition cables bring the high tension to the spark plugs. In old ignition systems (electromechanical) the tension reached approximately 15kv. In last generation systems, it can reach 40 kv.
Due to this tendency the raw materials used on their production are nowadays more select and resistant.
Nowadays the biggest part of the ignition cables and ignition spark suppressors are made of silicone and FACET is constantly following the OE standards.