25 ug/mL each component in Hexane. Standard contains: n-Octane, n-Decane, n-Dodecane, n-Hexadecane, n-Heneicosane, n-Tetratriacontane, Acenaphthene, Acenaphthylene, Anthracene, Benzo(a)anthracene, Benzo(a)pyrene, Benzo(b)fluoranthene, Benzo(g,h,i)perylene, Benzo(k)fluoranthene, Chrysene, Dibenz(ah,)anthracene, Fluoranthene, Fluorene, Indeno(1,2,3-c,d)pyrene, Naphthalene, Phenanthrene, Pyrene. Stores at room temperature. A NIST traceable reference material. 1.5mL ampule.