Rubbonon

"Some of my customers aren't even from here. Therefore, their compensation can be a little... unorthodox. But that makes it even more valuable. Have you heard of Rubbonon or Selicus? Such fascinating materials that aren't exactly in abundance... on this planet."

- Cedric Gaucho to Avery Silman

Rubbonon is an extraterrestrial material.

Superhero Suits
Rubbonon is occasionally used in superhero suits designed for alien creatures by Cedric Gaucho.