The M9 9" Round Double-D search coil is the lightest coil in the range for the Minelab Manticore metal detector, weighing only 362g! The 9-inch coil strikes an excellent balance between depth, target separation, ground coverage and easily navigates through trash-filled environments while maintaining impressive depth for its size. Its low-profile design allows for easy movement through water when detecting beaches and rivers, it's also waterproof down to 5m (16ft). Genuine Minelab Accessory Coil. This coil can only be used on the Manticore metal detectors.