The Indo Rocker Board deck has a "rocker" or "reverse-camber" bottom.  This rocker bottom means that the deck is not flat and thus less deck contacts the roller creating a looser feel which allows the rider to perform advanced balance board tricks like 180 or 360 degree spins.  Additionally, the Indo Rocker Board does not have our traditional stops at the ends of the underside of the deck which also makes the Indo Rocker board easier to rotate and spin.  The Indo Rocker board uses the same 6.5" diameter roller that all our "Original" models come with.  If you own an Indo Original and think you have mastered it, then the Indo Rocker Board is your next logical upgrade.