Swish goes the Mermaid’s Tail as they swim along the front of the Mermaid Jumping Castle. Pretty castle for your little princess. Our open front Mermaid jumping castle is 4m x 4m x 3.6m (High Arch) and is compact for small backyards and driveways. Jumping castle hire for 8 year olds + under. UV Sun shade Roof + wet weather cover for protection all year.