The Kness Tip-Trap has an ingeniously simple design that provides a safe, humane, and effective way to rid your house of mice. Simply remove the end cap and place peanut butter in the bait cup. Place the trap in a problem area and wait. As the mouse moves inside the trap to fetch the bait, the trap will tip up automatically, closing the trap door. Then you can release the mouse a safe distance from your house, allowing it to go on with its life and you to go on with yours. The Tip-Trap Live Capture Mouse Trap is made of polypropylene and is resistant to stains and odors. Tip-Traps are easy to clean and can be reused or disposed of after mouse is caught . Humane. Re-usable.