The term football usually refers to a ball made of cow hide leather, which is used in professional and collegiate football (in Canada and the United States). The ball may also be made of rubber or plastic materials. The first match of American football was played on November 6, 1869, between two college teams, Rutgers and Princeton, under rules based on the association football rules of the time. The most popular forms of the game are professional and college football, with the other major levels being high school and youth football. The football itself is an oval ball, similar to the balls used in rugby or Australian rules football. s inflated to ​12,5 to ​13,5 pounds per square inch (psi) and weighs 14 to 15 ounces (397 to 425 grams). Click start and join us on the green football field!