because it is safe and strong
steel is a good material for a bumper as it is cheap
Making it out of cheese simply would not produce the same tone.
Steel and geometry, tension, straight, aches and channels make a good bridge
That could depend on several factors like essential life span, carrying capacity and length.
True the prices vary according to the material used, steel, silver, brass, iron etc. If you are looking for some good light material that not too heavy or expensive then I suggest you go for the polished steel finished trays.
cheapest material is Mild steel having very good properties of shaft.
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Kevlar would be a good choice, preferably backed with steel/ceramic inserts for extra protection.
The only practical restriction of the building material is durability in water - untreated paper would not be a good choice. Otherwise you can use any material you like. Commonest materials - various plastics, wood and steel.
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I only know one material that make good resistor that is STEEL(if not heated)
Because it is durable, non rusting and looks good.