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5.50 ounces is about one-and-one-tenth times as heavy as a Baseball.
In other words, it's 1.0731707317073 times the weight of a Baseball, and the weight of a Baseball is 0.93181818181820 times that amount.
(MLB rules)
Per Major League Baseball rules, a baseball must weigh between 5 ounces and 5.250 ounces. A major league pitcher can throw a baseball at up to 150 kph (91 mph) (with a fastball pitch), with record-setting pitches as fast as 171 kph (106 mph).
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