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315 miligrams is about one-fifth as heavy as a Playing Card
In other words, it's 0.18 times the weight of a Playing Card, and the weight of a Playing Card is 5.6 times that amount.
(ISO 216 B8 size, 2.5" x 3.5")
A single ISO 216 B8-size playing card weighs 1,800 miligrams. 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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