What did Romans write with?

[Lothia]

Ave Civitas,

I know that drafts of letters were written on waxed tablets with a stylus. I don't know what was used to put ink to paper.

I believe that the quill was an invention of much later centuries. I know modern pen nubs have a fine groove that holds ink as it is written on the page, but what did Romans write with and are there any images or examples online for me to see?

Thanks,
Tom