Maxforce FC Select Roach Bait Gel kills roaches by ingestion and contact, and spreads from roach to roach through the Domino Effect of Fipronil. Maxforce FC Select will kill even the most bait adverse and finicky roaches. With the broadest label available, the best bait acceptance, and virtual population elimination, it's no wonder Maxforce Roach Killer Gels are some of the most popular roach baits among professionals.