(12) 20 oz. Cans. Wasp & hornet spray, non-flammable and non-chlorinated, contains tetramethrin, sumithrin. STOMP is an EPA registered, high dielectric monochlorinated wasp and hornet spray. This product sprays 15 to 20 feet and can be used indoors (attics and other places where nests are built) or outdoors on hornet, wasp and yellowjacket nests. Product should be applied in the evening after all the insects have returned to the nest. Dielectric strength is 40.1 KV by ASTM test method D-877.