Additional Details ------------------------------ Product description: This Detech 13" Ultimate Search Coil is for use with the Nokta Makro Simplex metal detector. This coil is an exceptional accomplishment and was designed with close collaboration by the engineering teams at both Detech and Nokta Makro metal detectors. The final results in the field are extraordinary! By upgrading to this coil you will achieve the best depth and most accurate pinpointing. Compared to traditional DD coils, the patented Ultimate coil technology provides you with more stable operation, better ground balancing, and the most accurate target identification. Search coil is waterproof and the coil cover is included. Exceptional Performance in the Field: In test results performed by the Detech design team engineers, this coil increases the depth over the stock coil of the Nokta Makro Simplex as follows: - Small coin-sized targets: approximately 15% depth increase - Larger coin-sized targets: approximately 20% depth increase - Larger relic sized targets: approximately 30% depth increase Material: Metal