Keep control of the game as a referee. The JAKO referee memo cards will help you. In case the cards from the JAKO referee set are not sufficient, a complete set of 20 player cards can be ordered. Besides the yellow and red cards, the player's note cards are the most important accessory of a referee. On the pre-printed player note cards, individual information can be noted for each player, such as warnings, time penalties and sending-offs. The rounded corners make it easy to take the player's note cards out of the breast pocket and prevent them from getting caught.