The National League is comprised of players primarily 9 years old. Based on the number of teams and registered players, along with the results of previous manager's evaluations and player's tryout results, a sizable number (typically no more than 33%) of 8 year old players will be assigned to this league. These teams are assembled using a confidential skills-based assignment process (not a draft by managers). Players do not remain on the same team from year to year. Scores and records are kept. Because of player's ages, certain rules are modified to ensure safety and the highest level of play. There are post-season playoff games.