Each cartridge refill pack contains 3 pre-filled cartridges to be used exclusively with the Kerminator Wasp Lance. Each refill cartridge contains 20g of an insecticide powder (Vulcan DP 0.5 w/w Permethrin). In most cases, each cartridge contains enough insecticide to treat one wasp nest due to the accurate targeting of the Kerminator® applicator. This minimises contamination of the environment and non-target species.