A new type of "skateboard" that has a swivel joint in the middle, making it possible to lean the board in different directions at the same time. Its very weird to get the hang of, but once it clicks the board turns very sharply and quickly. It also allows you to pump far more affectively and I've often seen kids riding up hills by twisting and pumping the board. I'm starting to get the hang of it and its a load of fun.