| 摘要 |
A golf club device, more specially a putter (1), comprising a head (2) and a shaft (3) attached to the head (2), possibly being provided with a grip, wherein the moment of mass inertia of the head (2) constitutes less than seventy-nine per cent of the total moment of inertia of the putter (1) when the putter (1) is rotated about an axis of rotation (4), which is perpendicular to the longitudinal axis (7) of the shaft (3) and about one hundred and twenty centimeters from the longitudinal axis (5) of the head (2), and/or wherein the mass of the shaft, including a possible displaceable weight (11), divided by the length of the shaft is at lest one hundred and seventy grams per meter of shaft in a shaft which is up to one meter long, and at least one hundred and ninety grams per meter of shaft in a shaft which is longer than one meter.
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