This is how BBs are made:
All BBs, reguardless of brand, are typically made in 3 or 4 major factories in China. The defining factor that you pay for is the polish quality and precision in the molding process. The polish is typically done in a tumbler with a polishing powder in it (like super fine sand).
The materials that I am looking at are... different. There are certian characteristics that I need for my idea to work, so I have a few things in mind that I am going to try, but nothing solid yet that I really want to discuss yet ;-)