Original self-setting trap used for generations. Ultra Power All-Metal Selfset Traps from The Big Cheese® are engineered to deliver effective control of rodent pests indoors and out – just like the professionals use. Selfset traps have been trusted by generations of users. They are easy to set, suitable for use in any weather conditions, and they are guaranteed to kill mice, or your money back. Durable galvanised metal construction for indoor and outdoor use.