A description referring first to fig9 there is shown in cross section the prosthesis of the present invention generally denoted as 10 prosthesis 10 includes a core 12 a filler 14 and an outer wrap or sheath 16 the prosthesis 10 as shown is a hip prosthesis having a neck area 18 a proximal area 20 and a distal stem area 22 neck area 18 includes a trunion 19 adapted to receive a spherical head not shown in the preferred embodiment core 12 extends the entire length of the prosthesis and in order to provide for holding the prosthesis in a mandrel may extend a predetermined distance beyond the ends of the desired final length of the prosthetic device while in the preferred embodiment core 12 extends the entire length of the prosthetic device it will be seen that the core is only structurally important in the neck area and that once the loading is transferred to the outer sheath 16 in neck area 18 of the prosthesis the core serves no further structural function referring to fig2 4 the core is shown to be made up of sheets of preimpregnated carbon fiber reinforced thermoplastic prepreg such as a polyetheretherketone peek the core is molded to the shape shown in fig3 which as stated above includes sections c and d which extend beyond the desired length of the prosthetic core and are included merely.