The aluminum "Moonstar" was the freshman release of German yo-yo maker Came-Yo (Harry Baier at the helm) around 1999. You could optionally install the included set of rubber rings on the inside perimeter of each halve for additional weight and increased spin times (shown pre-installed in the package). You could also optionally install another set of included rubber rings on the outer perimeter of each halve (also shown pre-installed in the package). The outer perimeter rings added about a gram of extra weight. They also served protect the finish of the aluminum and cushion the impact of the yo-yo when it returned to your hand.
Uses a size E ball bearing axle. No response pads, same as early Custom Yo-Yo models.