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A baseball has three basic parts: the round cushioned cork pill at its core, the wool and poly/cotton windings in its midsection, and the cowhide covering that makes up its exterior. The pill consists of a sphere, measuring 13/16 of an inch (2.06 centimeters) in diameter, made of a cork and rubber composition material. This sphere is encased in two layers of rubber, a black inner layer and a red outer layer. The inner layer is made up of two hemispheric shells of black rubber that are joined by red rubber washers. The entire pill measures 4-⅛ inches (10.47 centimeters) in circumference.
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