Some customers like the convenience of our disposable beetle traps but don't like the waste of throwing them away every time. Simply fill the individual reservoirs in the trap with canola/sunflower/vegetable oil (the trap will hold approximately 25mL) or diatomaceous earth and drop it in between the frames. The arms hold the trap securely against the side of the frame. It's easy to tell at a glance whether the trap is full or not. There is a central reservoir which some beekeepers fill with apple cider vinegar to attract the beetle.