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370 grains is about thirteen times as heavy as a Playing Card
In other words, the weight of a Playing Card is 0.077 times that amount.
(ISO 216 B8 size, 2.5" x 3.5")
A single ISO 216 B8-size playing card weighs 28 grains. Although this size is the most common home playing card, many casinos use "bridge size" cards — 2,640 sq. mm (4.036 sq. in) smaller in area.
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