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2.10 inches is about one-tenth as tall as a Bowling Pin.
In other words, it's 0.140 times the height of a Bowling Pin, and the height of a Bowling Pin is 7.140 times that amount.
(USBC specifications; tenpin)
According to the United States Bowling Congress specifications, a tenpin bowling pin should be within 0.0313 inches of 15 inches in height. The USBC further mandates that certified pins be made of sugar maple wood, unless otherwise approved by the organization.
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