The Yokohama Rubber Co., Ltd.

Shinya Ono

Yoshihide Nakamura

Tadashi Miura

Toshiya Hase

Disclosed is an iron golf club set which comprises a plurality of golf clubs of different counts, each golf club having a steel shaft, wherein a steel shaft of a shorter golf club is set heavier than that of a longer golf club; a step formation region is provided in a position having an equal distance for all of the golf clubs from a grip end in a shaft axial direction, the step formation region having a shaft outer diameter changed in a plurality of steps therein; a specific area is set in a position having an equal distance for all of the golf clubs from a sole end of a head in the shaft axial direction, and is nearer to a grip with respect to a shaft full length in the step formation region of each golf club; and a step interval in the specific area is set narrower than that outside the specific area.

Iron golf club set

A multi-piece solid golf ball which comprises a core consisting of an inner layer core and an outer layer core and a cover layer for covering the core, wherein the diameter of the inner layer core is 20 to 35 mm, the thickness of the outer layer core is 2 to 11 mm, the Shore D hardness (A) of the surface of the inner layer core and the Shore D hardness (B) of the surface of the outer layer core satisfy relational expressions, 15&lE;(A)&lE;50, 35&lE;(B)&lE;70 and (A)&lE;(B), and the cover layer is made from a resin composition comprising 50 to 90 parts by weight of an ionomer resin and 50 to 10 parts by weight of diene-based rubber. This multi-piece solid golf ball is excellent in impact resilience, flying performance, shot feeling and durability.

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Tokyo, Japan

Shinya Ono