They're plastic prepainted things, there's a little bit of bend to them however if all you do is wash and drybrush then they'll be ok.
Actually, Colonel O' Truth has done amazing things in conversion. I've seen the WIP's, and I still don't know how he does it!

Just picked up some more so hopefully will be drafting up some racing rules soon!
Oh, gawd, I hope so! Please do share; even if I only read 'em, I find such such a treat!
Doug