I forgot to mention that I do 'Stack' copper 1 cent pennies.
Copper/bronze does have a history as money.

They didn't cost me any more than 1 Cents each, most were accumulated over the decades into family coin jars and almost forgotten. I've help a friend find a car part in a auto wreckers yard and found more than a pocketful of 1 cents pennies from coin trays, glove compartments, inside arm rests and ash trays or scattered all over the car floor unwanted. Pennies are even sold by the pound out of my local Thrift shop.

Pennies dated 1996 and earlier is 96% copper with $0.029USD worth of copper in each.
$0.01 CAD face value Penny is worth more than 4 cents CAD current commodity value.
The CAD Penny was officially demonetized in 2015 but are still worth 4 cents!!! A modern day best kept secret.

Save your old copper coins.
I forgot to leave an upvote.