Golf shaft

A golf club shaft (100), comprising:

• a shaft distal end (110), a shaft proximal end (120), a shaft outer diameter, a shaft length (130) of no more than 38″, and a shaft mass of 100-150 grams, wherein each point along the shaft length (130) has (i) a shaft flexural rigidity, and (ii) a shaft torsional rigidity;
• the shaft (100) having a butt portion (1000) joined to a tip portion (2000), a shaft center of gravity located a shaft CG distance from the shaft proximal end (120) of at least 13″, and a kickpoint located a kickpoint distance from the shaft proximal end (120);
• the butt portion (1000) having a butt portion distal end (1010), a butt portion proximal end (1020), a butt portion length (1030) of 20″-26″, a butt portion sidewall (1040) having a butt portion sidewall thickness (1050), a butt portion inner diameter (1060), and a butt portion outer diameter (1070);
• the tip portion (2000) having a tip portion distal end (2010), a tip portion proximal end (2020), a tip portion length (2030) of 6″-16″, a tip portion sidewall (2040) having a tip portion sidewall thickness (2050), a tip portion inner diameter (2060), and a tip portion outer diameter (2070), wherein the tip portion outer diameter (2070) of a portion of the tip portion (2000) is at least 25% less than the butt portion outer diameter (1070) of a portion of the butt portion (1000);
• the butt portion (1000) formed of a non-metallic butt portion material having a butt material density, a butt portion mass that is 60-85 grams and is 35-75% of the shaft mass, a butt portion elastic modulus, a butt portion shear modulus, and each point along the butt portion length (1030) having (i) a butt portion area moment of inertia, (ii) a butt portion polar moment of inertia, (iii) a butt portion flexural rigidity, and (iv) a butt portion torsional rigidity;
• the tip portion (2000) formed of a metallic tip portion material having a tip material density that is at least 15% greater than the butt material density, a tip portion mass that is no more than 85% of the butt portion mass, a tip portion elastic modulus, and a tip portion shear modulus, and each point along the tip portion length (2030) having (i) a tip portion area moment of inertia, (ii) a tip portion polar moment of inertia, (iii) a tip portion flexural rigidity, and (iv) a tip portion torsional rigidity, wherein the tip portion flexural rigidity of a portion of the tip portion (2000) is less than the butt portion flexural rigidity of a portion of the butt portion (1000);
• wherein a first portion of the shaft (100) extending ⅔ of the shaft length (130) from the shaft proximal end (120) has a first average flexural rigidity and a first average torsional rigidity, a second portion of the shaft (100) extending ⅓ of the shaft length (130) from the shaft distal end (110) has a second average flexural rigidity and a second average torsional rigidity, and the first average torsional rigidity is at least 50% of the second average torsional rigidity;
• and
• wherein within a region located between a first point located 5 inches from the shaft proximal end (120) and a second point located 24 inches from the shaft proximal end (120), the following are true:
• (a) in a first portion of the region the shaft flexural rigidity is at least 50% greater than a minimum tip portion flexural rigidity, and
• (b) in a second portion of the region the shaft flexural rigidity is at least 50% greater than a minimum butt portion flexural rigidity, and the shaft torsional rigidity is at least 50% greater than a minimum butt portion torsional rigidity.