The Storm Secure Rat Bait 10kg is made of crushed grain and wax block containing 0.005% flocoumafen and just one mouthful is enough to kill. A blue hexagonal block with a central hole allows each 20gm clock to be anchored securely in baiting points for the best targeting. It is effective against rats and mice including resistant strains. This product is mould and moisture resistant and is for indoor use only. It comes in blocks with a hole so you can secure it on a nail/rod to prevent a rodent from dragging it away.