Correction for the weight of an American Football
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How heavy is 489.450 monme (匁)?
It's about four-and-a-half times as heavy as an American Football
The weight of an American Football is about 109.61815608330 monme (匁).
(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 105.83821966670 monme (匁) and 113.39809250 monme (匁). Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.