Can anyone tell me how chokens are made and what they are made out of? I have several that are magnetic and several that are not magnetic, however, they weigh about the same. Some of them I have feel like light plastic. How many companies made them? Are they still in use anywhere? How many different are there? What denomination did they come in? I have $1's and one $5. Why did they stop making them? Is there a listing of them. I would be grateful for any help.