The standard size for a basketball backboard is 6 feet wide and 3 1/2 feet high. The surface should be flat and usually there is a 2-inch thick rectangle above the rim that is 24 inches wide and 18 inches high.
Other important dimensions include that the basketball rim should be 10 feet above the ground and that the rims are 18 inches in diameter. To prevent backboard damage, the majority of rims are attached using a shock absorbing connection that absorbs the pressure caused by a basketball slam. Although many backboards are made of glass, metal and wood backboards remain in use.