Boric acid roach powder is 99\% boric acid and 1\% silica to keep powder from caking and clumping. Special lure attracts insects to feed on the boric acid. Kills roaches, palmetto bugs, waterbugs, and silverfish. Puffer bottle with included straw applicator reaches into cracks and crevices where insects hide. EPA (Environmental Protection Agency) approved for use in all 50 states. 16 ounce bottle.