When fins placement is correct they will work on any board. Lots of Santa Cruz guys have them on their gunz. Even out at Mavericks.Thank you for posting all of this info. Its really helpful but also a little beyond my understanding when talking about fin placement and cant. For a newbie, is there an "ideal" shape for the twinzer? SK posted a 6'6 or 6'8 mini log with a twinzer a few months ago that seemed interesting but most seem to on a fish or egg shape.