California Code, Code of Civil Procedure - CCP § 630.04

(a) Juries in expedited jury trial cases shall be composed of eight jurors, unless the parties have agreed to fewer. No alternates shall be selected.

(b) The court shall allow each side three peremptory challenges. If there are more than two parties in a case and more than two sides, as determined by the court under subdivision (c) of Section 231, the parties may request one additional peremptory challenge each, which is to be granted by the court as the interests of justice may require.