that looks like an appropriate blast media for preparing these aluminum-alloy wheels for painting. Take a look at these two links from Harbor Freight:

http://da.harborfreight.com/cpisearch/web/search.do?keyword=blast+media

http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=92155

The first includes the 2nd where as the 2nd is what I think I need. Now the question as to whether
" 24 Grit walnut shell blast media " will work or just gum up my wet sandblasting accessory that fits onto my 1500 PSI consumer model high-pressure washer. Anyone out there know... how about you Tom over in Stuttgart... do you have a response from a factory source?

Sam