@ShelbyLohrman
I found this set online.
https://www.bestchessset.com/janus-silver-and-bronze-extra-heavy-metal-chess-pieces-with-4-5-inch-king-and-extra-queens-pieces-only-no-board/
Its comparable to what you're discussing @ a weight of 5.34 lbs. It's electroplated zinc.
Anodized aluminum would be my choice as well. But the black/silver and black/gold sets may not fly.