In older vehicles this is done via an Ignition Distributor, with newer vehicles using Multi-Outlet Coils with Ignition Leads connected directly to the Spark Plugs. Lemark Ignition Leads utilise a Copper or Glass Fibre core using either Silicon Insulation or Wire Windings to help suppress radio signals.
The HT Leads Ignition Cable Kit HOES1089 would be a great fit for anyone working on antique or performance vehicles that require specific ignition system wiring and cable connections to function correctly.