In professional wrestling and e-federations, a stable is a group of wrestlers within a promotion who have a common element -- friendships, either real or storyline, a common manager, or a common storyline -- which puts them together as a unit. Stables can be small alliances of three to six wrestlers (such as D-Generation X, Evolution and The Four Horsemen), or supergroups that include up to half the promotion's talent roster (such as the New World Order, Planet Jarrett and Sports Entertainment Xtreme).