The Big Cheese Ultra Power XL Rat Trap is performance tested to ensure effective control of rats just like the traps that professionals use. The XL Rat Trap is also 50% bigger and more powerful than other rat traps, making it ideal for use against Super Rats and roof rats. The trap is baited, ready-to-use and easy to set. Simply remove the bait cover then squeeze the trap with one hand to set XL Rat Traps are guaranteed to kill rats, or your money back. Heavy infestations may require more traps. For best results when using more than one trap, place them 4-5 metres apart along walls and runways where rats are active.