Diatomaceous earth. A natural contact insecticide that works by causing abrasions on insects as they come in contact with the product. Digestible by earthworms, so it causes them no harm. Very effective in controlling snails and slugs in bedding areas and around houses. Controls cockroaches, ants, earwigs, crickets, millipedes, centipedes, silverfish, fleas, carpet grasshoppers, slugs, and other crawling insects as listed. Use a hand duster or bulbous duster to apply a light coating to areas where crawling pests are found or may hide. Ideal for indoor and outdoor use.