Beginning with the 1989 event, the Royal Rumble has now become an annual January pay-per-view for the World Wrestling Federation (WWF, now WWE). The 1989 event also began the tradition of having 30 wrestlers in the titular match (with the exception of the 2011 event, which had 40), while beginning with the 1993 event, the winner traditionally earns a world championship match at WrestleMania (with the exception of the 2016 event, in which the title was the prize as the champion defended the title in the match). While originally only contested by men, a women's version was introduced at the 2018 event, and the event now features a men's and women's match. Beginning with the pay-per-view broadcast in 1989, the Royal Rumble became one of the promotion's original four pay-per-views, along with WrestleMania, SummerSlam, and Survivor Series, which were eventually dubbed the "Big Four".