Each team has, on average, 16 players. All team members must be at least 21 years of age and can only play on the team with which they are registered.
Teams can have a maximum of 11 players on the field at a time, with a minimum of five women. If a team is playing with less than 10 players, they are not required to have a catcher. While there is no minimum number of players required on the field, a team may not field more than one more male player than female player at any time.