Abstract: The invention is a device attachable to a golf club which provides feedback, when the ball is struck on a sub-optimal area of the clubface, or at a suboptimal angle. The device is shaped to cover certain areas of the clubface, except the desired striking zone, such that the golf ball strikes the device during an impact resulting from a golf swing with sub-optimal swing path, attack angle or club face angle. The device provides physical and audible feedback, during impact of a golf swing, due to the differing feel and sound generated when the ball impacts the device, rather than the optimal area of the clubface. The device provides visual feedback, as due to the convex shape of the device, a differing golf ball flight is achieved when the golf ball impacts the device rather than the optimal area of the clubface.