You're asking about the materials for a "electric pen" which could mean several things. To give you the most helpful response, please clarify:

Do you mean:

* A pen that uses electricity to write or draw? This could be a pen that uses a heated tip to melt wax or a pen that uses an electric current to transfer ink.

* A pen that has electrical components or functions? This could be a pen that has a built-in microphone, or a pen that uses a laser pointer.

Once you clarify the type of electric pen you have in mind, I can provide a more specific answer.