The big Kahuna! This Detech 15 x 12″ SEF Butterfly Search Coil is for use with the Whites MX Sport and MX7 metal detectors. Cover the ground fast with maximum depth especially on large, deep objects. Ideal for hunting fields and areas without alot of trash. Compared to traditional DD coils, the patented SEF coil technology provides stable operation, better ground balancing and the most accurate target identification. Search coil is waterproof. Coil cover is included.