Patent ID: 8128508

Claim:
A shaft set comprising plural shafts used for wood type-golf clubs each having a club length of about 40 inches to about 48 inches, wherein among the plural shafts, a shaft used for a longer club has a smaller amount of change Δ 1 in bending stiffness in a section from 600 mm to 800 mm from a tip of the shaft, and wherein among the clubs using the plural shafts, the amount of change Δ 1 in bending stiffness decreases at a constant rate in a range of 0.7×10 3 kgf·mm 2 /mm·inch to 1.6×10 3 kgf·mm 2 /mm·inch per inch increase in club length, and the bending stiffness at a position 800 mm from the tip of the shaft decreases at a constant rate in a range of 0.1×10 6 kgf·mm 2 /inch to 0.4×10 6 kgf·mm 2 /inch per inch increase in club length.