Softballs are larger, heavier versions of baseballs, typically measuring 30.5 centimeters in circumference and weighing about 180 grams. They are primarily used in the sport of softball, which is played by two teams of nine or ten players. The game can be played in various formats, including fastpitch and slowpitch, each with its own set of rules. The outer layer of a softball is usually made of leather or synthetic materials, while the core is filled with a rubber or cork center. Softballs are designed for durability and can withstand the impact of being hit with a bat, making them suitable for both recreational and competitive play.