Kills wasps, yellow jackets, and hornets on contact. Jet spray reaches nests up to 20 feet away. Foaming action traps insects and residual spray kills insects returning to treated nest. Water-based so it is non-flammable and will not stain house or barn siding with an oily residue. Contains: 0.04% Cypermethrin and 0.02% Prallethrin.