99-0 chillin mix was a popular blend sold by PAH. Originally, it was one of the few alternatives to spice. It differs in a couple ways. It would be fair to say that spice is more like an indica cannabis high, and 99-0 is more of a sativa high. It is reported to contain a cannabinoid agonist like all spice alternatives. It probably contains more JWH-018 than Spice which gives a very strong sativa high.