The Continental Timing Belt Kit - 135397 is a comprehensive kit of products designed to service and maintain a car's timing belt. It includes three essential components: a timing belt, a tensioner, and an idler pulley. These components work together to ensure that the engine's valves and pistons are properly synchronized, allowing for smooth and efficient operation of the vehicle. The timing belt is a crucial part of the car's engine, responsible for controlling the opening and closing of the valves. The tensioner helps keep the timing belt at the correct tension, while the idler pulley guides the belt and helps it run smoothly. This kit is designed to be compatible with a variety of car models and provides all the necessary components for a complete timing belt replacement. By regularly replacing the timing belt and its accompanying components, car owners can ensure the longevity and optimal performance of their vehicle's engine.