The NEW " Fisher 7" Concentric Round Teardrop Search Coil " is designed for use with the Fisher F22 and F44 Metal Detectors. NOTE: This Search Coil is Not Compatible with the Fisher F11. This Fisher Search Coil has been upgraded with the "Latest Technology" so that you can take Full Advantage of Everything your Fisher F- Series Metal Detector has to offer including More Sensitivity on Smaller Objects and "Improved" Target Separation than Larger Coils. All Fisher Searchcoils are Electrostatically Shielded and Waterproof. A Great Coil for all kinds of Targets including Coins, Jewelry, Relics and More. Made in U.S.A.