California Code, Business and Professions Code - BPC § 18755

No contestant in an amateur boxing contest shall use any bandage on his or her hand or arm except soft surgical bandages not over two inches wide and ten yards in length for each hand, and one winding of surgeon's adhesive tape not over 1 1/2 inches wide placed directly on the hand to protect that part of the hand near the wrist.  This may cross the back of the hand twice, but not extend within one inch of the knuckles.