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350 grams is about nine-tenths as heavy as a Football (American).
In other words, it's 0.85144046085190 times the weight of a Football (American), and the weight of a Football (American) is 1.174480243750 times that amount.
(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 396.89332375 g and 425.242846875 g. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.
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