How do you make a baseball?
Construction varies. Generally the core of the ball is cork,
rubber, or a mixture of the two, and is sometimes layered. Around
that are various linear materials including yarn and twine,
sometimes wool is used. A leather cover is put on, in two pieces,
and stitched together using 108 stitches of waxed red cotton
thread. Rolled stitching is flatter and creates less
air-resistance. This is the type of stitching used for major league
balls and is ideal for the game and everyday play. Official Major
League balls sold by Rawlings are made to the exact MLB
specifications (5 ounces, 108 stitches) and are stamped with the
signature of Commissioner Allan "Bud" Selig on each ball.
Baseballs are made from a cork/rubber ball, various sized yarn,
and leather. Starting with the ball, the thickest yarn is wound
around it, and at various points a smaller yarn is wound around
each layer. Last the layer of yarn is covered by the leather tied
together by red yarn.