I asked that guy where he gets his rubber, and he responded "trade secrets," haha.

If you're serious though, I found these guys who sell rubber for casting stuff: http://www.smooth-on.com/

They sent me some samples, and I picked one that I thought would be best for brake hoods, and they also have dyes in all colors. I was all set about a month ago to make Dura Ace/600 AX replicas, but got sidetracked with school. I'll get back to it one of these rainy days.