On EM pins there are various Voltages through out the game and that might vary for each game. 120V usually a wire with plastic insulation. If you look at a schematic the voltage ratings are written on them near the diagram part for the transformer.
The usual safety precautions do apply to pinball machines. Un-plug the game to do any service work. When testing anything live, do not stand with bare feet on a concrete floor you will become a route to ground, wear running shoes or a shoe with out a leather sole. Do not lean against another pin while working on another pin, same thing, you could become a route to ground.