As always it depends. Any number of players from the same school can play on the same team June 1 thru July 31. At that point you are limited to four players who have played for the school. Usally in coming 9th graders don't count UNLESS your middle school has teams that play in a school league then they do count aganist the four on any one team. BUT any number of players from any one school can play indoors together because the OHSA doesn't consider indoor fast pitch... softball. Got it. lol