From what I remember of our media kits (that I had to put together) at a past job, it included a current PR, an about us sheet, I think, a finicial statement of sorts.. I don't remember what went in it exactly other than a press release, the rest is pure guess on my swiss cheese memory. I'd suggest looking at major company websites, see what they have in theirs. If you have the time, request a media kit from them and see if that helps.