Our cockroach bait contains cornstarch, vegetable oil, and glucose. It's a powerful bait formula that kills cockroaches quickly, leaving no residue; Use for several weeks at a time to prevent roaches from reappearing. Its use is simple: open the package, take out a piece of bait, and tape it to the bottom with a piece of double-sided tape, securing it in an area where cockroaches are known to haunt. Contains an active ingredient designed for cockroaches to kill them quickly, leaving no residue.