The government of Detroit, Michigan mayor, the nine-member Detroit City Council, the eleven-member Board of Police Commissioners, and a clerk. All of these officers are elected on a nonpartisan ballot, with the exception of four of the police commissioners, who are appointed by the mayor. Detroit has a "strong mayoral" system, with the mayor approving departmental appointments. The council approves budgets, but the mayor is not obligated to adhere to any earmarking. The city clerk supervises elections and is formally charged with the maintenance of municipal records. City ordinances and substantially large contracts must be approved by the council.