The metal free weights are made from cast iron.
The TKO 10lb ankle weights use metal bars and a reed feeling material.
I believe it is an office desk that weights a lot. Usually of metal. Made in the USA.
Typically it is Cast Iron* that is used to make weights.
This plate tree is constructed from steel and is able to reliably hold up to 300 lbs. worth of weights.
If it weights 100 pounds then it weighs 100 pounds no matter what it is made of.
They are usually made of metal. Most pure plastic equipment is frowned upon. (Especially the pink weights)
Wheel balancing weights are made from lead.
barbell
Metal free weight tend to be heavier than plastic ones. It is always recommended to get real weights over plastic ones.
the one with silver in it
Barbell