Trick box
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A trick box or fun box is a feature common to many skateparks. It is a raised feature designed to allow a skateboarder to ollie up onto one of its edges and rail grind off the far end of it. In its simplest form, it is a small concrete slab sitting between 12 and 18 inches high by a few feet on each side. More elaborate versions will have been fitted with steel coping to reduce wear, both on the feature itself and on the riders' truck axles. They can be made of wood and are usually on tabletops or on flatground.