The thickness of a U.S. quarter, or quarter dollar, from front to back is 1.75 millimetres (0.0689 inches). The diameter, the length of a line drawn across the centre of the circular coin, is 24.26 millimetres from edge to edge (0.955 inches).
The composition of a quarter consists of 8.33 percent nickel and 91.67 percent copper. A quarter has a mass of 5.670 grammes. Since 1796, the United States Mint has been manufacturing quarters. Early quarters were constructed with silver, necessitating trimming or shaving of the coin’s edges to remove the valuable metal. The edge of modern quarters is reeded or ridged to prevent defacement. The value of a quarter is 25 cents, but rare or antique coins can be extremely expensive, with some being worth hundreds of dollars.