A tubular product is made of a fiber composite material and is composed of an inner layer and an outer layer. The inner layer is formed of a fiber tow by the filament winding method, whereas the outer layer is formed of one or more fiber sheets by the sheet rolling method. By virtue of the inner layer, the tubular product has a uniform rigidity. The outer layer serves to reinforce the flexural strength of the tubular product.

A golf club shaft comprises a first section and a second section, wherein the first section is made of a fiber tow of composite material and formed a tube by filament winding method. The second section is made of a fiber layer of composite material and formed a tube by sheet-rolling method. The first and the second segment overlapped and fixed together to form the golf club shaft. The first segment is design to provide the golf club shaft to have a homogenous mechanical property, and the second segment is designed to provide the golf club shaft to have a superior deflection capacity

A flexible golf putter for use in the game of golf when putting a golf ball into a hole. The construction of the putter serves to limit the amount of bodily movement necessary. By keeping the putter, golfer, and ball in one plane of motion, the precision of the putt is increased and the possibility of error is decreased. The flexible golf putter has a head portion, an elongated shaft portion, a top flexible grip portion mounted on the top end of the shaft portion, and a T-shaped appendage positioned between the shaft top end and bottom end. The appendage provides an additional handle for the putter and is used by the golfer to control movement of the golf ball.

The invention relates to a set of golf clubs employing a two-piece golf club shaft wherein the lengths of the first and second shaft members vary as the loft of the golf club varies. The set of clubs includes a plurality of golf clubs having varying lofts extending from lower loft golf clubs to higher loft golf clubs, wherein each golf club includes a club head and a shaft having a distal end and a butt. Each shaft includes a first member having a first end located at the butt end of the golf club shaft and a second end positioned slightly short of the distal end of the golf club shaft. A second member is secured to the second end of the first member. The second member extends from the second end of the first member to the distal end of the golf club shaft and includes a first end securely coupled to the second end of the first member and a second end which is ultimately secured to a golf club head. The second member progressively decreases in length as the plurality of golf clubs extend from the lower lofted golf clubs to the higher lofted golf clubs.

A device for coupling two shaft members of differing diameters. The device includes a barrel and a reaction mass. The barrel is hollow and includes an outside coupler formed by the exterior surface of an upper portion of the barrel, an inside coupler formed by the inside surface of the barrel, and a reaction mass interface formed by the exterior surface of a lower portion of the barrel. The outside coupler is sized to fit inside a hollow end of the first shaft member. The inside coupler is sized to receive the second shaft member. The reaction mass slides over the second shaft member and into position on the reaction mass interface of the barrel. The parts are secured together with an adhesive.