Menace 7.9% Flowable insecticide is a liquid concentrate containing 7.9% bifenthrin for the control of a wide variety of insect pests in nearly all residential and commercial settings. Menace 7.9% Flowable is a fast-acting synthetic pyrethroid with low to no odor and provides quick "knock-down" of insects, quickly ensuring helathier turf and public environments. It acts by paralyzing the nervous system of insects, but the active ingredient is not absorbed by plant foliage.