Pa , the vortex heads are 2 blade . They work great on deer . I dont know if I would use them for elk but for deer they work very well . I think 5shot did a reveiw on them and liked them . They fly just like field points , open on contact , and every deer I' ve seen hit with them has been a passthru . Never thought Id shoot mechanicals but after seeing the results my hunting patrners in Pa have been getting the last few years , I think Im sticking with them , One of the guys uses them for wild boar allso and has had great sucess .