"COLORBOND" is a brand of prepainted steel sheet produced by Blue Scope Steel spun off from BHP Billiton.
It has an oven-baked finish on both sides, comes in various profiles including corrugated and is promoted as being a tough barrier for wind, hail, falling branches and flying debris, resisting chipping, peeling and cracking and being non-combustible and termite resistant.
Wikipedia Entry For Bluescope Steel