A baseball is a ball used primarily in the sport of the
same name, baseball. It is generally between 9 inches (22.9 cm) and 9¼ inches
(23.5 cm) in circumference, and 5 ounces avoirdupois (142 g) in weight, though
sometimes different-size balls may be used in children's leagues.
 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 216 stitches of waxed cotton
thread which is typically red in color. 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, 216 stitches) and
are stamped with the signature of Commissioner Allan "Bud" Selig on each ball.
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