Big Cheese Ultra Power XL Rat Trap. The Ultra Power XL Rat Trap from The Big Cheese 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.