Quick question for anyone that knows...

I have access to use a tire machine and wheel balancer anytime I need it, but the only catch is that I need to supply my own weights. I thought that would be simple (one style for steel wheels and one style for alloy). I went online today and found that there are many styles of weights.

What style of weight do I need for my stock 15" alloy wheels on my '06 Aveo?

Thanks all in advance!