What makes up the core center of a typical baseball?

A baseball has 3 basic parts. There is the round cushioned rubber 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 must consist of a sphere (core), measuring 13/16 of an inch (2.06 centimeters) in diameter, made normally of a cork and rubber composition material. The sphere (core) is encased in 2 layers of rubber, a black inner layer and a red outer layer. The inner layer is made up of 2 hemispheric shells of black rubber that are joined by red rubber washers. The core of a baseball is also often coated in a latex adhesive or rubber cement.

Approximately 600,000 baseballs are used by in Major League Baseball (MLB) games during the season. The average baseball remains in play for only 5 to 7 pitches in a MLB game. Each ball must weigh between 5 and 5.25 ounces (141.75-148.83 grams) and measure between 9 and 9.25 inches (22.86-23.49 centimeters) in circumference to conform to MLB standards.