Provided herewith an ultra-fine cable assembly comprising an insulative housing defining a mating portion and a mounting portion. The housing defines with a plurality of passageway, and each passageway has a slit at mounting portion of the housing. A plurality of contact terminals is assembled in the passageways of housing, with a mating section arranged in the mating portion of the housing, and a tail portion located at the mounting portion of the housing. The tail portion of the contact terminal is arranged to be accessible through the slit provided with a wide-opened space offset from each other. A plurality of coaxial wires is provided and each has an electrical conductor running through the slit and in contact with the tail portion of the contact terminal. A transferring layer is positioned over the mounting portion of the housing and has pre-formed conductive material aligned with each of the tail portion accessible within the wide-open space, and with the preformed conductive material disposed within the wide-opened space.