Minelab 15" All Terrain 3 kHz Waterproof Search Coil for X-TERRA Detector 15" X-TERRA Coil in 3 kHz is suited to low mineralized areas and is great for extra depth Waterproof Lightweight with a Robust Construction Easy Pinpointing DD Configuration Good Stability and Sensitivity Supplied with Fitted Skid Plate Compatible: Minelab X-TERRA Series Metal Detectors (Except X-TERRA 30, 50 and 305) Size: 15" Weight: 26.1 oz. Coil Shape: Round