these changes made the boards more stable. they helped downhill longboarding grow into a sport. the international gravity sports association (igsa) was its governing body. the cutout deck was added in the 1990s. it had sections cut out around the wheels. this stopped the wheels from touching the board during hard turns. there has been many changes to longboard technology because of the many different ways people ride them. modern longboard decks can be made from many materials. these include fiberglass composites, aluminum and carbon fiber.