These repellent sticks utilize the powerful odor of garlic oil to drive away gophers and moles! Use a probe to pinpoint the location of the underground tunnel and to create a 3/8˝ diameter hole into the tunnel. Remove the rubber stopper from the repellent stick to release the garlic odor, drop the stick into the tunnel, and then cover the hole. Sticks are effective for 10 to 12 months and biodegrade in approximately 24 months. Pack of 12.