Stitched by Hand
A baseball begins with a small, spherical core of cork and rubber encased in thin layers of rubber. Hundreds of yards of wool yarn are machine-wound around this core, followed by more than a hundred yards of white cotton twine. The finished interior of the ball is coated with a layer of rubber cement to seal the twine in place. Workers then take two pieces of white leather and wrap them over the ball before sewing the pieces together by hand with thick, red thread. The finished ball weighs between 5 and 5.25 ounces and has a circumference of between 9 and 9.25 inches.