The company states it's made from 100% petroleum products:
Pale Oil, naphtha, and isopropyl alcohol; which are claimed to be effective solvents for the complex hydrocarbon deposits.
Whether the combination actually removes significant deposits that are actually affecting performance is yet to be proven, though the anecdotal evidence of reviving some old vehicles is partially compelling.
In any case, it's fun to freak out the neighbors...is your car on fiyuh?!?!