There are 119 ridges around the edge of a quarter. Quarters contain an alloy of 8.33 percent nickel and 91.67 percent copper. They are 1.75 millimeters thick and 24.26 millimeters in diameter. Prior to 1965, quarters were made entirely out of silver.
The ridges on quarters and other high-value coins, such as dimes, half-dollars and dollars, were initially used to prevent counterfeiting and discourage shaving material from their sides, as they were made of precious metals. Coins are no longer made using precious metals, but the ridges remain in the quarter's design to aid in identification of the coin by the visually impaired.