Aside, there is no reason for them to be bronze, they look nice, but you could 3d print them and fill them, cast out of ceramic in plaster mold, make them from

Aside, there is no reason for them to be bronze, they look nice, but you could 3d print them and fill them, cast out of ceramic in plaster mold, make them from plaster, etc. If I were going to do a one-off set, I'd 3d print them and fill with sand.