Typically it is Cast Iron* that is used to make weights.
barbell
the one with silver in it
Barbell
iron,metal,weights
The metal free weights are made from cast iron.
That metal sounds a lot like aluminum.
They are made of lead
penis metal
Silicon is the non-metal used to make micro-chips for computers/electronics.
All satelites are made of metal.
shiny metal
Epsom salt is also known as magnesium sulfate. The metal that is used to make these salts is magnesium. Magnesium is an earthy alkaline metal.