Our cockroach dark rooms contain cornstarch, vegetable oil, and glucose. It can be a powerful trapping ingredient to ensure that cockroaches are attracted and destroyed. Use for several weeks at a time to prevent roaches from reappearing. Its use is simple: Place the product in hidden areas where cockroaches are common, such as kitchen corners and bathroom crevices, to attract and trap them. The trapping effect is enhanced, and the cockroaches have nowhere to run. The ingredients are safe, non-toxic and harmless, friendly to humans and pets.