| 摘要 |
A device for the use of practising golf comprises a object 2 with a hollowed core 6; a flowable substance 8; and a hole 4 leading from the surface of the device to the hollowed core, wherein the flowable substance 8 is contained within the hollowed core 6; and the flowable substance is capable of leaving a visible mark. The device is preferably a substantially spherical practice golf ball and can be used to locate the point of contact a golf club face makes on the ball by the flowable substance exiting the hole and leaving a mark on the club face, thereby determining the success of hitting the sweet spot of the club face. The flowable substance may be a powder, liquid or gel. |
