Outside, Cynoff dust is ideal for use as a residual treatment where carpenter ants and stinging insects enter structures. Inside, Cynoff dust makes a powerful bed bug control tool for cracks, crevices and voids. Cynoff dust contains Zeta Cypermethrin, a new active ingredient, designed for quick kill and long-lasting residual. Cynoff is available in a unique 16 oz. container which can be used to apply the dust or to fill other application equipment. With an anti-clumping formula and good float properties, Cynoff dust provides even insecticide coverage wherever it applied.