In league and competition games, it is forbidden to stack disks on the start bar but players indulging in friendly games often use it for just this purpose. 43cm from the front of the board, a flat bar of wood lies across the top of the game under which the disks pass. Wooden disks of diameter 5.2cm are pushed up the board from the front of the game which is without a side barrier. A Sjoelbak board is a wooden board 2 metres x 0.4 metres with three sides about 5cm high.