DIECAST SOCIETY....and was unimpressed with the fit of the side and front glass on some of the models. On the Penske car it appeared 'OK'..... on others it appeared to have been cut incorrectly and thus the fit was compromised. At the prices being charged, I will pass on this sort of sloppy work....i.e. I'm voting with my wallet.....I think Looksmart or even Tecnomodels can do better......at a 'friendlier' price point.