Kills wasps, yellowjackets and hornets on contact. Jet spray reaches nests up to 20 feet away. Rapid knockdown and kill. Spray residual 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. 18 oz aerosol can. Contains: 0.20% Tetramethrin and 0.20% Sumithrin.