The contents of a quarter have changed over the years. The Red Book says the outer layers are 75% copper and 25% nickel bonded to a pure copper inner core. The weight is 5.67 grams. This has not changed since 1965. Note that the mint does make special silver quarters each year that are not put into circulation. These are a combination of silver and copper.
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One US quarter has a weight equal to 0.00567kilogram.
The first US quarter dollars were minted in 1796.
One US quarter is 5.67 grams or 0.00567kg
24.26 mm (0.955 US inches)
24.30mm