Boric acid formula with added lure, kills Roaches, Waterbugs and silverfish. Just place tablets in out of the way areas where roaches travel and roaches will find them. One box can treat an entire house, making it one of the most efficient and cost-effective ways to kill a roach. Clean and easy to use tabletsLong lasting when kept dryEPA approvedActive ingredient 40 percent boric acid, other ingredients include sugar, flour and formulated lure