While some rules regarding backboards tend to gain attention, such as the 1992-93 National Basketball Association rule change that said the 24-second clock gets reset only when the ball hits the rim as opposed to the rim or backboard, less attention is paid to the specifications that actually define this piece of basketball equipment. In fact, you are likely more apt to look at the shot clock atop the backboard than the board itself. However the NBA sets specific rules as to what is a backboard.
Dimensions
In the NBA, the regulation backboard is 72 inches wide by 42 inches tall. The board has an inner square that is 24 inches wide and 18 inches tall. The lines marking this inner square are 2 inches wide. The circular basketball rim that is attached to the backboard is 18 inches in diameter and is painted orange.
Materials
The front surface of the backboard must be flat as well as transparent. The hoop must be made out of pressure-release metal and be approved by the NBA. The white cord making up the net is 15 to 18 inches long, and must be made so it temporarily checks the ball as the ball passes through.
Height
While other courts may differ in their overall size and layout, such as those used for college or high school play, the dimension for the backboard and rim remain the same. The regulation distance for the height of the rim attached to the backboard -- 10 feet -- also is the same for all levels of play.
Distance
In NBA play, the free throw, or foul, line is 15 feet from the backboard's face. The free throw line is 2 inches wide and parallel to the court's end line. This also is consistent among all levels of play. Also, at least one electric light has to be placed behind each backboard in a place that is obvious to officials The light must red and it has to be synchronized so it comes on when the horn sounds to signal the expiration each period.
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