There are two major distinctions between the constitutional roles of the nine hereditary rulers and the four Yang di-Pertua Negeri. While the Yang di-Pertua Negeri are members of the Conference of Rulers, they cannot participate in the election of the Yang di-Pertuan Agong, discussions related to the privileges of the Malay rulers and matters concerning the observance of Islam. In addition, the Yang di-Pertua Negeri do not function as the Head of Islam in their states; the role is fulfilled by the Yang di-Pertuan Agong.