O'Brien System 135 cm We designed the System for the intermediate level wakeboarder, but packed it with high performance features that will make learning new moves easier. Predictable continuous rocker line and single long-base center fin provide a classic on-water feel - with added control enhanced by double barrel channels exiting the tips of the board. With four sizes ranging from 119cm to 140 cm, the System has you covered no matter who you are. SYSTEM 135 length 135cm / 50.78" width 42.5cm / 16.75" rocker: 2.25" Continuous weight 100-180 lbs. fin set up:1.35" Flank