A magnetic marker for marking a site in tissue in the body. In one embodiment the magnetic marker comprises a multi-stranded cable. In one embodiment, the marker comprises a magnetic metallic glass. In another embodiment, the marker is in a nonspherical configuration having an anisotropy ratio less than 9. In yet another embodiment, the marker is in a non-spherical configuration having an anisotropy ratio less than 6. In yet another embodiment, the marker is in a non-spherical configuration having an anisotropy ratio less than 3.
