Mura City is covered with Steel. The reason that the city is made of steel is because of they make weapons and armor and even cars here. Steel is a big part of the city if they were to run out of steel the city wouldn't be able to function right without their products being made to bring in money. Each house is made of steel and on the inside it looks like a basic wood house. This place is has a high crime rate so basically living here means your making your own death bed.