The Detech SEF Pro 12×10″ coil is robust and goes deeper than standard metal detecting coils. Preferred by many users of American and Australian detectors for it’s boost in performance, low weight and balanced size. Made for most makes and models of metal detectors.. The S.E.F. Butterfly search coils offer better ground balance, more stable operation in all conditions, even deeper in the ground, and more accurate target identification. Coil color: black Coil cover color: black Warranty: 2 years