Surefire Pro Cockroach Gel 30g 0.5g/kg Fipronil This ready-to-use bait gel provides reliable and long lasting control of cockroaches. The superior active ingredient, Fipronil, kills cockroaches that come into contact with the bait and is also spread back to the colony via the transfer effect to eradicate the entire nest. The gel stays moist and attractive to cockroaches for up to 3 months and when used correctly has no odour and no mess.