The Thunder Coil is the latest development from the engineers at NEL that combines both high levels of detection depth and selectivity. Working with a slow swing will maximize its ability in finding not only large and medium targets but small targets which weigh less than 1 gram at 20 cm deep as well. The Thunder coil is suited for finding coins, treasures, and artifacts in the field of military battles in any region world-wide. NEL Thunder is a DoubleD search coil with dimensions of 14.5" long x 10.5" wide and weighs 20.1 Ounces, 570 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. Works with Garrett Ace 100, 150, 200, 250, 300, 350, and 400 metal detector models. Not compatible with Garrett Ace APEX models.