The Beru Ignition Service Kit - 135168 is a comprehensive kit designed to service the ignition system of a car. It includes four essential products to ensure the smooth functioning of the car's ignition system. The first product is a set of spark plugs, which are responsible for creating the spark that ignites the fuel in the engine. The second product is a set of ignition wires, which carry the electrical current from the spark plugs to the ignition coil. The third product is an ignition coil, which transforms the low voltage from the battery into the high voltage needed to create a spark. Lastly, the kit includes a distributor cap, which distributes the spark to each of the spark plugs in the correct firing order. This kit is essential for maintaining the performance and efficiency of a car's ignition system.