The ball shall be made up of an inflated (12 1/2 to 13 1/2 pounds) urethane bladder enclosed in a pebble grained, leather case without corrugations of any kind. It shall have the form of a prolate spheroid and the size and weight shall be: long axis, 11 to 11 1/4 inches; long circumference, 28 to 28 1/2 inches; short circumference, 21 to 21 1/4 inches; weight, 14 to 15 ounces.
The Referee shall be the sole judge as to whether all balls offered for play comply with these specifications. A pump is to be furnished by the home club, and the balls shall remain under the supervision of the Referee until they are delivered to the ball attendant just prior to the start of the game.
The league appointed Equipment Manager will supply 78 balls for testing to the Referee two hours prior to kick-off. Two hours prior to kick-off, eight balls will be specially marked by the Referee and used for kicking only.
In the event a football does not meet the required specifications, or no more balls are available, the Referee will use backup balls. If all balls are no longer available, the best available ball will be used. If this occures the event must be reported to the league Chief Compliance Officer.
In case of wet, slippery or other adverse conditions, a playable ball will be used if requested by the offensive team’s center. The Game Clock will not stop for the ball change (unless undue delay occurs).