In the Australian Football League (AFL), a size 5 football is used in all senior matches. This is the standard size for adult competitions. The ball is made of leather and has an oval shape. It is slightly larger and heavier than a size 5 soccer ball.
For junior competitions, smaller sizes are used. Size 4 balls are typically used for players aged 14 and under, and size 3 balls are used for players aged 12 and under. These sizes are smaller and lighter to accommodate the smaller hands and lower strength of younger players.
The AFL also has specific regulations about the pressure inside the football. The pressure must be between 62.0 kPa and 76.5 kPa. This ensures that the ball bounces consistently and is easier to handle.
It’s interesting to note that the size and pressure of the football have evolved over time. The first footballs were made of inflated pig’s bladders and were much more irregular in shape!