The dimples on a golf ball help it travel almost twice as far as a smooth ball can. When a golf ball is hit into the air, the dimples generate a thin layer of slow-moving air that reduces the drag (pull) on the ball. Golf associations have not standardised the number or shape of dimples allowed on a golf ball, so most manufacturers make balls with different numbers, sizes, shapes and patterns of dimples. These dimples can be shallow, deep, sharp edged, large or small and can have various shapes like circular, teardrop, oval or even hexagonal. On an average, a golf ball will have between 300 and 500 dimples. The most common number of dimples on a golf ball is 392.