This Detech 8" Monoloop Closed Design Search Coil is for use with the Minelab GPX, GP, SD Series Gold Detectors. By upgrading to this coil you will achieve the best depth and most accurate pinpointing. Compared to traditional DD coils, the patented Monoloop Closed Design Search Coil technology provides you with more stable operation, better ground balancing and the most accurate target identification. Search coil is waterproof and coil cover is included.