Plant Pro-Tec Gopher & Mole Repellents will fill the entire tunnel of a gopher or mole with garlic vapors that make the tunnel unusable for an entire year.  The repellents use highly concentrated garlic oil that is contained in a patented slow-release system that will continuously release garlic vapors for over 12 months. Application is easy: you simply drop the repellent into the gopher or mole tunnel. Includes 12 units.