Swingball is the award winning portable tether tennis game that’s easy to set up with its all surface base & compact carrying case. Play tennis anywhere & never lose the ball again. The pro set is just like Classic Swingball but designed for older children and adults who want a faster game! More spirals on the Swingball head means games last longer. For easy and quick set up, simply fill the base with water or sand for stability. You’ll be ready to play on the grass, decking, concrete, and even sand!