Final answer:
In a pneumatic system, the two types of conductors used are metallic and non-metallic conductors, with metals like copper being common for their conductive properties.
Step-by-step explanation:
The two types of conductors used in a pneumatic system are metallic conductors and non-metallic conductors. Metallic conductors, such as copper and aluminum, are often used in electrical wires due to their high electrical conductivity and physical properties like malleability and ductility. Non-metallic conductors can also be used in pneumatic systems, especially when flexibility or other material properties are needed.