F Series 7" Concentric Round Concentric Search Coil:

This 7" Concentric Teardrop Coil is designed for use with the Fisher F11, F22 and F44 metal detectors. This latest Fisher search coil has been upgraded with the latest technology so that you can best take advantage of everything that your Fisher Metal Detector has to offer. In general, larger searchcoils will give better depth with larger targets and better ground coverage. However, sensitivity to smaller objects may be sacrificed. Smaller searchcoils will offer greater sensitivity to smaller objects and improved target separation in trashy soil. All Fisher Searchcoils are electro-statically shielded and waterproof.