Tumbling Wire Wrapped Rocks

[cicisunflower.livejournal.com]

Any rock tumblers in here?

I have what is probably a simple question. I recently got a rock tumbler, and will have my first completed batch of rocks in the next week (all going well). I am planning on taking these, and wrapping wire around them to make pendants for my necklaces.

My question is this: I've read where people take wire wrapped rocks, and tumble them to strengthen the wire, and they say to use 'steel shot'.... What is steel shot? And where would I get it?