Copper Bullion Stack Test: 7 Copper Items (Bars, Cubes, Pennies) In this video, we put together a no-nonsense copper bullion stack test—showing 7 different copper items you can actually hold, stack, and store. We start with the classic favorite: 95% copper, pre-1982 pennies (before the U.S. switched to zinc). Then we move into .999 fine copper in multiple formats—bars, cubes, and a 1 kilo replica—to show what “stacking copper” really looks like. Featured in this stack: • 34 lb bag of 95% copper