2000ug/mL each component in Methylene chloride. Standard contains: Acenaphthene, Acenaphthylene, Anthracene, Benzo(a)anthracene, Benzo(a)pyrene, Benzo(b)fluoranthene, Benzo(g,h,i)perylene, Benzo(k)fluoranthene, Chrysene, Dibenzo(a,h)anthracene, Fluoranthene, Fluorene, Indeno(1,2,3-c,d)pyrene, 2-Methylnaphthalene,Naphthalene, Phenanthrene, Pyrene, and 1,2,3-Trimethylbenzene. 1.5mL per ampule. Stores refrigerated. A NIST Traceable Reference Material.