Advanced 18" Concentric Search Coil The Detech 18" Concentric Search Coil for Minelab GPX, GP, SD Series Gold Detectors is based on the design of the worlds largest concentric search coil. While large in size, the coils is extremely light for its size weighing in at approximately 1.5 Pound. Extreme Depth for Treasures and Gold Nuggets This coils is designed for searching deep ground, for relics, deep coins, hoards, weapons, helmets, troves, and large and small gold nuggets at depth. See the video on this page for examples of nugget size and expected depth capabilities. Precision Technology: Handcrafted Design This coil is produced using a combination of the most innovative modern technologies and handmade production techniques. This coil is made from fiberglass, carbon, polyester, epoxy resins and balsa. All materials used are of the highest quality, produced in Germany, Austria and France. The coil is made with a Litz conductor and adheres to all Minelab PI detector requirements. Head Back to Cleaned out Sites Armed with this coil, you now have the best tool for searching deep into the ground at those sites that were previously thought to have been cleaned out. With this coil in hand, all sites previously searched, are now ready to be revisited. Unique Advantages to this Coil: Exceptional sensitivity; Extremely high level of ground balance; Good stability to electromagnetic interferences; Excellent discrimination of unwanted targets, better than that of traditional DD coils.; Precise pin-pointing; In the "mono" mode, the coil operates with its entire area, unlike dd coils, which operate with half of their surface area.; Precise inductive balance; Waterproof; High UV protection; Shock and scratch resistant.