The present invention relates to a magnetic stimulation (MS) coil arrangement which utilises the effect of the position of a ferromagnetic material to enhance the magnetic field on the patient side of the coil and reduce acoustic noise associated with the addition of ferromagnetic material. The present invention comprises a magnetic stimulation coil arrangement comprising one or more coil windings formed from an elongate conductive element and having a forward side for presentation to a patient and a rearward side, the magnetic stimulation coil arrangement further comprising a distortion arrangement for distorting a magnetic field produced by the one or more coils positioned adjacent to the rearward side, the distortion arrangement having a plurality of ferromagnetic components and a carrier for carrying the ferromagnetic components, the ferromagnetic components being spaced from one another by the carrier.
