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A baseball is a ball used primarily in the sport of the same name, baseball. The ball features a rubber or cork center, wrapped in yarn and covered in leather. It is 9 to 91⁄4 inches (229-235 mm) in circumference (27⁄8-3 in or 73-76 mm in diameter). The yarn or string used to wrap the baseball can be up to one mile (1 1⁄2 km) in length. Some are wrapped in a plastic like covering, while others have a leather finish.