It's a Latex rubber mold that I plan on dying black or other colors on request. I have a few other styles in mind as well. Ones with better street tread, etc... The molding kit I've ordered also allows me to do plastics. I'm probably going to sell these with special hubcaps. I think the tread on these offroad tires especially, may cause them to rub against the bodies with stock rims. This will also allow me to make some wider tires for better traction.
After I've tested a few finished pieces, I'll sell them for dirt cheap to begin with so I can get the word out there. I'm thinking the regular price for a set of tires with custom hubcaps will sell for around $15.
EDIT:
Hubcaps = Rims