This model comes with a stringerless polstyrene blank,it is re-inforced with 2 parallel high density "blue foam" stringers and a blue carbon look parabolic rail"wrap" to help provide a bit of rigidity through the whole board.These features reduce the boards weight and add more flex and spring that is often required for the smaller waves. Combining with the drop in length and increase in width and volume overall the funfactor of this design is through the roof and will get you stoked and pumped to surf waves that often get overlooked.