The 8 x 5.5-inch elliptical Double-D M8 coil is waterproof to 5 m (16 ft) and provides great sensitivity to small targets. It is perfect for finding treasure in high trash areas. It is also ideal for detecting in difficult terrain. The M8 coil weighs 400g with the included protective skidplate, bringing total weight of the MANTICORE detector to 1.2kg with the M8 attached.