1)A bag made of paper is a paper bag.
2)A bowl made of plastic is a plastic bowl.
3)A key made of metal is a metal key.
4)A ring made of silver is a silver ring.
5)A watch made of gold is a gold watch.
6)A chimney made of iron is an iron chimney.
7)A dish made of glass is a glass dish.
8)A belt made of leather is a leather belt.