The NEL Big is the deepest coil in the world for different metal detectors, which is confirmed by tests of independent experts in the various forums and searchers at metal detecting meetings! It is recommended as a coil when searching for deep items. The coil is excellent for finding large targets at great depths as well as for small targets which weigh 1 gram and more at 25 centimeters, 10 inches deep. This coil is superior to a standard coil in depth by 50% with approximately 40% more ground coverage. This coil is recommended for use in open terrain. NEL Big is a DoubleD search coil with dimensions of 15" long x 17" wide and weighs 32.4 Ounces, 920 Grams. The coil is waterproof and fully submersible, the body is filled with epoxy resin. Additionally a black protective coating, the same as used on marine boats, makes it possible to use the coil without coil cover. Recommended for professionals and amateurs! Includes coil cover, hardware and Velcro cable strap. 2 Year Warranty.