Onslaught FastCap Spider and Scorpion Insecticide is an economic and easy to use formula that provides quick knockdown and long lived residual control of scorpions, spiders, and other insects listed on the label. This one of a kind formulation is made of Exponent brand synergist, Esfenvalerate, and Prallethrin. Onslaught FastCap Spider and Scorpion Insecticide can be applied in a number of areas both indoor and outdoor, as well as food areas. This product is labeled for use as an indoor broadcast treatment.