Absolutely hollow and about 1 mm. minimum thick.
Model unpainted.
If you want to reply a tire, I'll do it. all scales, rims, threads, with the embossed side mark or logo you like and with all the units you want in one only file to save your money. Just ask.
I can re-scale them. Ask for your favourite scale!
Very useful advices about cleaning and painting frosted ultra detail printed models here:
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