Skateboarding originated from surfers attaching roller skate wheels to wooden boards to promote their surf brands. Skateboard decks, trucks, and wheels have different designs depending on how they will be used, such as concavity and flex for different tricks. Common skateboard tricks include ollies and flips, slides and grinds, airs and grabs, as well as footplant tricks and other unique tricks. There are over a hundred brands that manufacture skateboards with their own signature styles and designs.