Rubber was any type of material with the mechanical (or material) property that it could undergo much more elastic deformation under stress than most materials and still return to its previous size without permanent deformation. Rubber was normally used to make droid parts.
- Star Wars: The Old Republic
- Star Wars: Tiny Death Star (Non-canonical mention)
- "The Spira Regatta"—Star Wars Adventure Journal 1
- Planet of Twilight
- Synthetic rubber on Wikipedia