Just for anybody who might care this purple boss with the flatter wing has a medium heart beat dome and is to date my longest boss.. a little turn when flat..but not too understable...very glidy...more high speed stable than similar katana...but in a good way.. I think very pleased with the new bosses anybody throws 350 plus flat with a regular disk I think would enjoy these 450 plus throwers will find them to be heizer flip machines... And I've been enjoying them for hand thrown with a little hyzerr they flip up and glide tremendously