NEW 2006 ! MODEL III : All Around Twin. The Model III is JL's most popular design. A perfect blend of flatwater power, all around control and wave maneuverability. Medium tail block, dominatrix bottom and rail shape, 4 sizes for every wind strength and rider size. 125cm x 14.75”, 133cm x 15.25”, 139cm x 15.75”, 145cm x 17”.