Makro Gold Racer GR26C – Concentric Search Coil – (26 cm x 14cm – 10” x 5.5”). Especially in low mineralization, it may be more sensitive to small gold nuggets and may provide more depth compared to DoubleD search coils. It also provides a cleaner target response and better discrimination on shallow targets. However, it gets more affected by the ground compared to DD search coils in highly mineralized areas. Waterproof search coil.