referring to fig1 of the drawings , the reference numeral 100 generally designates a hollow golf club head embodying features of the present invention . the hollow golf club head 100 generally comprises a face portion 110 , an integrated sole and wall portion 112 , and a crown portion 114 defining a body 116 with an interior cavity 118 . a hosel portion 124 is connected to and / or integrated into the body 116 for receiving a shaft ( not shown ). furthermore , a removable , port cover 120 , which is described in further detail below with reference to fig3 , provides access to the interior cavity 118 , thereby allowing the placement of weighting material , such as lead tape , into the interior cavity 118 . in the preferred embodiment , the hollow golf club head 100 comprises a two - piece golf club head . the first piece comprising the integrated sole and wall portion 112 and the face portion 110 , including the hosel portion 124 . the second piece comprises the crown portion 114 , which is welded or otherwise attached to the first piece . other embodiments , such as a three - piece golf club head , however , may be used as is known in the art . fig2 is a bottom view of the hollow golf club head 100 , further illustrating the positioning and sizing of the weighting - port cover 120 in the preferred embodiment . preferably , the weighting - port cover 120 is positioned on the bottom , i . e ., the sole , of the hollow golf club head 100 and away from the face portion 110 . therefore , the weighting - port cover 120 is preferably positioned such that the weighting - port cover 120 is not visible by a golfer when addressing a golf ball . furthermore , the placement of the weighting - port cover 120 away from the face portion 110 allows placement of weighting material about , or on , the interior side of the face portion 110 , and along the heal / toe portions of the hollow golf club head 100 , as will be described in greater detail below with reference to fig4 . the weighting port cover 120 is preferably attached to the body 116 via a plurality of flush - mounted bolts 122 , and , optionally , may be coated with a friction - reducing material , such as teflon . in order to reduce the friction , the possibility of the weighting - port cover to “ snag ” onto grass , thereby affecting the swing path , and the wear and tear , the weighting - port cover 120 is flush - mounted to the integrated sole and wall portion 112 by the plurality of flush - mounted bolts 122 . fig3 illustrates the hollow golf club head 100 with the weighting - port cover 120 removed . the body 116 preferably includes a recessed portion 310 configured for receiving an optional vibration - dampening ring 312 and the weighting - port cover 120 . the vibration - dampening ring 312 , such as a ring made from foam , rubber , and / or the like , allows the weighting - port cover 120 to be securely fastened , preventing a vibration / rattling noise that may occur as a result of swinging the club and / or striking a ball and sealing the interior cavity from exposure to outside elements , such as sand , water , and / or the like . the plurality of flush - mounted bolts 122 pass through the weighting - port cover 120 and screw into the recessed portion 310 of the body 116 . alternatively , other methods , such as a weighting - port cover that screws into the body 116 , latches , press - fits , or the like , may be used . the preferred embodiment , however , allows for weighting - port cover 120 that is curved to match the contour of the body . fig4 illustrates a side view of the weighting - port cover 120 attached to the body 116 in accordance the one embodiment of the present invention depicted in fig3 . as one skilled in the art will appreciate , the recessed portion 310 allows a smooth contour to be formed by the integrated sole and wall portion 112 and the weighting - port cover 120 when assembled . in an alternative embodiment , however , the weighting - port cover 120 is recessed from the integrated sole and wall portion . fig5 illustrates the hollow golf club head 100 with the crown portion 114 separated from the integrated sole and wall portion 112 in order to illustrate potential placements of weighting material in accordance with embodiments of the present invention . the illustrated positions are presented for illustrative purposes only and , therefore , should not limit the present invention in any manner . furthermore , the positions may be used individually or in combination to further customize the location of the center of gravity . weight location 510 illustrates a low - front - center location , which is located on the integrated sole and wall portion 112 adjacent to the face portion 110 , that imparts less spin on the ball and a high trajectory , resulting in easier workability ( the ability to hit the ball from left to right and vice versa ) and more carry ( the distance the ball travels in the air ). weight location 512 illustrates a high - front - center location , which is located on the crown portion 114 adjacent to the face portion , that imparts less spin on the ball and a low trajectory , resulting in easier workability , less carry , and more rolling . weight location 514 illustrates a low - back - center location , which is located on the back - center of the integrated sole and wall portion 112 , that results in more forgiveness and a high trajectory . weight location 516 illustrates a high - back - center location , which is located on the back - center of the crown portion 114 , that results in more forgiveness and a low trajectory . weight location 518 illustrates a low - back - toe location , which is located on the back - center of the integrated sole and wall portion 112 along the toe , that results in more forgiveness and a high , fading trajectory . weight location 520 illustrates a high - back - toe location , which is located on the back - center of the crown portion 114 along the toe , that results in more forgiveness and a low , fading trajectory . weight location 522 illustrates a low - back - heel location , which is located on the back - center of the integrated sole and wall portion 112 along the heel , that results in more forgiveness and a high , drawing trajectory . weight location 524 illustrates a high - back - heel location , which is located on the back - center of the crown portion 114 along the heel , that results in more forgiveness and a low , drawing trajectory . weight location 526 illustrates a forward - center - center location , which is located on the center of the face portion 110 , that results in easier workability with a neutral trajectory . weight location 528 illustrates a back - center - center location , which is located in the vertical - center of the integrated sole and wall portion 112 , that results in neutrally forgiving club head . weight location 530 illustrates a low - center - center location , which is located on the center of the integrated sole and wall portion 112 , that results in a neutral side - spin with a high trajectory . note that this location is located on the weighting - port cover 120 for illustrative purposes only . as stated above , the weighting - port cover 120 may be located at any desired location , and a weight may be placed on the weighting - port cover 120 if so desired . weight location 532 illustrates a high - center - center location , which is located in the center of the crown portion 114 , that results in a neutral side - spin with a low trajectory . fig6 illustrates a driver golf club head embodying features of the present invention in which the weighting - port cover 120 is located on the crown portion 114 . fig7 illustrates a hollow , iron golf club head embodying features of the present invention in which a weighting - port cover 710 is provided . fig8 illustrates a hollow , putter golf club head embodying features of the present invention in which a weighting - port cover 810 is provided . fig9 illustrates an alternative embodiment as described above wherein the weighting - port cover 902 screws into the body . in this embodiment , the cover 902 includes a substantially curved threaded outer perimeter 904 . a weight 906 attached to an inner portion of the cover 902 is shown in phantom . reference numeral 908 is a seal , as has been described . the elements 902 , 904 , 906 and 908 comprise an assembly . it should be noted that the placement and size of the weighting port is shown for illustrative purposes only , and , therefore , should not limit the present invention in any manner . it is understood that the present invention can take many forms and embodiments . accordingly , several variations may be made in the foregoing without departing from the spirit or the scope of the invention . for example , the weighting port may be of a different shape and / or there may be a different method of accessing the interior of the club head , such as removing the sole of the club head , the back of the club head , or the like . having thus described the present invention by reference to certain of its preferred embodiments , it is noted that the embodiments disclosed are illustrative rather than limiting in nature and that a wide range of variations , modifications , changes , and substitutions are contemplated in the foregoing disclosure and , in some instances , some features of the present invention may be employed without a corresponding use of the other features . many such variations and modifications may be considered obvious and desirable by those skilled in the art based upon a review of the foregoing description of preferred embodiments . accordingly , it is appropriate that the appended claims be construed broadly and in a manner consistent with the scope of the invention .
a metal golf club head that allows a user to customize the location of the center of gravity . the metal golf club head comprises a hollow body with a weighting port . the weighting port allows a user to place weighting material inside the hollow body , customizing the location of the center of gravity , the swing weight , the total weight , and the balance of the golf club .