Classify each of the following as a conductor or insulator: steel, copper, rubber, wood, cardboard, aluminum
Steel: Conductor
Copper: Conductor
Rubber: Insulator
Wood: Insulator
Cardboard: Insulator
Aluminum: Conductor
### Instruction: Classify each of the following as a conductor or insulator: steel, copper, rubber, wood, cardboard, aluminum
### Context: 
### Answer: Steel: Conductor
Copper: Conductor
Rubber: Insulator
Wood: Insulator
Cardboard: Insulator
Aluminum: Conductor</s>