Minelab Smart Coil 6″ & Carbon Fiber Shaft for CTX 3030 Metal DetectorThe waterproof 6 inch round Double D coil for the Minelab CTX 3030 Metal Detector is very sensitive to small targets, and perfect for finding treasure in high trash areas. It is also ideal for maneuvering in difficult terrain. The Minelab CTX 3030 Carbon Fiber Lower Shaft is a replacement or backup for the shaft that comes standard with the detector. When you use multiple coils it is great to have it pre mounted on a shaft for faster switching coils.