Each kit contains 100 mg each of eight compounds.1-Chloro-2-butenecis-1,4-Dichloro-2-butene3-Chloro-1-butene Hexachloro-1,3-butadiene1,2-Dichloro-3-butene (3,4-Dichloro-1-butene) 1-Bromo-2-butene1,3-Dichloro-2-butene 4-Bromo-1-butene