US Patent 8409029 Golf club set

Groove depths D1 of clubs are defined as D1(1), D1(2), . . . , D1(n) in an order from the club having the smallest real loft angle L1, and groove widths W1 of face lines of the clubs measured by the 30 degree method of measurement are defined as W1(1), W1(2), . . . , W1(n) in an order from the club having the smallest real loft angle L1. At this time, a golf club set satisfies D1(1)≦D1(2)≦ . . . ≦D1(n). A ratio [D1(m)/D1(m−1)] of the groove depths D1 between two golf clubs with adjacent club numbers is 1.0 or greater and 3.0 or less. The golf club set satisfies W1(1)≦W1(2)≦ . . . ≦W1(n). A ratio [W1(m)/W1(m−1)] of the groove widths W1 between two golf clubs with adjacent club numbers is 1.0 or greater and 3.0 or less.