Catalytic Converter, containing a monolith with precious metals such as Palladium, Platinum and Rhodium embedded in the substrate. The purpose of this catalytic converter is to reduce C02 emissions by 70 to 80 percent, which is why all cars around the world are required to have one. As the metals that go into these components are rare and finite resources, it is important to recycle them when the car comes to the end of its life.