Australian Football is a sport played between two teams of eighteen players on the field of either an Australian football ground, a modified cricket field, or a similarly sized sports venue. The main way to score points is by kicking the ball between the two tall goal posts. The team with the higher total score at the end of the match wins. 

In The Laws of the Game 2008/2009, Fédération Internationale de Football Association (FIFA) addresses both the physical qualities of the ball and what to do if a game ball becomes defective. After more than 100 years as an international governing body of association football, they seem to be quite clear on the rules.

Major League Lacrosse was founded in 1991 as a professional outdoor lacrosse league.  The current rules include the use of a shot clock and allow for a 2-point goal to be scored.  While the website does not contain specifications for the ball, the history section of the site does offer this interesting information regarding the lacrosse ball.

The National Lacrosse League consists of men’s professional indoor lacrosse or Box Lacrosse teams. While they have a 95 page Official Rule Book, the rule regarding the ball remains a mystery.

Lacrosse is a sport played when people run around hitting each other with sticks and throwing “rocks”, but not just any rocks these are specifically defined by the NCAA! SECTION 16. The ball shall be white, yellow, orange or lime green smooth or slightly textured solid rubber — between 7-3/4 and 8 inches in circumference, between 5 and 5-1/4 ounces in weight and, when dropped from a height of 72 inches upon a concrete floor, shall bounce 43 to 51 inches at a temperature of 65 degrees to 70 degrees Fahrenheit.