Iron

Iron bars and objects appear in Airfield Chase, Smuggler's Plane, Angry Birds Seasons, Angry Birds Classic, Angry Birds Friends! and Angry Birds Space. If you hit it, it will make a "ching" sound.

Iron is a hard material to break. Chuck, Terence, Bomb, Matilda, Mighty, Hal, and Bubbles can break the iron. However, in Angry Birds Space, iron is more fragile. 

In Angry Birds Seasons, the iron is indestructible but can be thrown at lava and melt. In Angry Birds Star Wars, Chuck "Ham" Solo can break iron with 3 lasers. The lasers will reflect so they can hit other Pigs. It serves as steel in Angry Birds Star Wars because once shot with lasers or damaged by a lightsaber, it will appear inside of the wood/glass/hard metal.

Blocks
Angry Birds	Glass • Wood • Stone • Grey Blocks
Angry Birds Seasons	Gold • Clouds • Snow • Ghost Blocks
Angry Birds Rio	Sand • Iron