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A skateboard is a small board with small wheels on the bottom. A skateboarder rides on the board as it rolls. Skateboarders stay balanced by moving their balanced bodies. Most skateboards are 81 centimetres long and 23 centimetres wide.
The wheels are made of a special kind of tough plastic.
People have been using skateboards for more than 120 years. The first skateboarders made their own boards in the early 1900s.
Some of the early homemade skateboards had roller-skate wheels attached to a board.