Abstract: A golf practising device having a one piece molded mounting arm with a ball at each end, that arm being pivotally mounted to a base about a horizontal axis so as to allow substantially free rotation thereabout, and that arm being reinforced by a novel structure in such a way that the device simulates the feel of a conventional golf ball when either of the device's balls is hit by a golf club. The novel reinforcement structure includes a reinforcing rib on each of the arm's side faces that extends lengthwise between the two balls, a reinforcing rib on the arm's front face that extends lengthwise from one ball toward the other but stops substantially short thereof, and a reinforcing rib on the arm's rear face that extends from the other ball toward the one ball but stops substantially short thereof, all reinforcing ribs extending outwardly from the arm's faces.