Both the Rocker and Kicktail models are for advanced riders only, as they both do not have stops on the bottom.
The rocker series features full bottom (convex) "rocker" throughout the length of the deck. This results in a super loose feel that is perfect for pulling off advanced spin-type tricks. Great for surfers, snowboarders, kitesurfers and wakeboarders.
The Kicktail series have a flat bottom with upwards curving ends, similar to skateboards, snowboards and skateboards, making these particularly good for practicing technical tricks like ollies, finger flips, shuvit 360's etc.