A typical air hockey table consists of a large and smooth playing surface designed to minimize friction, a surrounding track to prevent ice hockey and hitting (rackets) from leaving the table, and track slots at both ends of the table as goals. At both ends of the table behind and below the goal, there is usually a hockey return. In addition, the table usually has some kind of mechanical device, which generates air cushion on the competition table through small holes, in order to reduce friction and improve the playback speed.