Depends on your league. Generally at least 10 are allowed, 1 for each defensive position (4 outfielders in slowpitch softball). Some leagues allow 1 or 2 extra batters that function similar to a designated hitter but they do not hit for a defensive player, they are just an extra hitter in the lineup. They are usually allowed so that more people can play. One is allowed in open or unisex leagues and two are allowed in coed leagues so that the number of men and women are equal.
2. Slowpitch and Fastpitch
10 on the field
460 or better
9 on the field in fastpitch and 10 in slowpitch
12 inch (same as 12u- ect.)
You may be wondering what the difference is among a slowpitch softball bat, a fastpitch softball bat and a regular baseball bat. The difference is in the technology of designing the bat. The length, weight and barrel diameter, among other features, are the main differences. Manufacturers have determined the size and weight that are optimal for hitting a slowpitch softball versus fastpitch, and have designed them accordingly.softballpickles .com
There are many leagues that at co-ed slowpitch softball. These leagues are designed so that many different ages of people can play. I know people in their fifties on these teams.
Construction and leather are the same (for respective models). Slowpitch gloves have bigger pockets to accommodate 12" softballs, however, slowpitch gloves generally are made for men. For Girls/Women's Fastpitch Softball, good gloves have slender fingerstalls to accommodate smaller finger and palms of girls and women.