For this design, both the marble ball and the base are new designs at the end of 2019. The base is a little smaller, and we do more works to increase friction. So you can feel it seems to be a bit soft, and make your hand more comfortable. And the color effect of the ball is also a little challenging to make. So for these reasons, the unit price is a little higher. But it’s worth it. There are some ways to reduce the cost, such as choosing a usual ball, or an ordinary base. We can mix and match them.