 On some of these tables the goalie becomes unable to get the ball once it is stuck out of reach in the corner; others have sloped corners to return the ball to play.Another major difference between table types is found in the balls, which can be made of wood (cork in the case of traditional French tables), various forms of plastic or rarely even marble and metal, varying the speed of shots a great deal, as well as the "grip" between the man and the ball and the ball and the playing surface.The table football robot Foosbot is claimed to have been beaten by a human several times, but has been tested against expert players.