Thanks for clearing that up for me guys
i thought that it may have been corn but wasnt sure and wanted to ask.
I'll have to buy some Flitz to use, seeing as i have read a lot of good things about it on AP, i'm trying the tumbler with some walnut shell and Novus 3 as i write this. will go and check how the parts are coming along a bit later.
BTW, i bough the tumbler here
http://www.shooters.com.au just incase anyone wants to know (or cares)