Also ich hab nochmal ewig rumgegoogelt, bis ich die "Reference Robocup Junior Rules" gefunden habe.

Dort findet ihr auch den Spielball:

An electronic ball shall be used, which will be provided by Wiltronics . The ball will transmit infra-red (IR) light. The ball will be close to 7.5 cm in diameter.
Und das Spielfeld:

The floor of the playing field will be covered with a printed gray scale that will be available from Semia Limited( www.semia.com )or RoboCup Junior.The playing field may be placed on a table or on the floor. Every effort shall be made to ensure that the field is flat and level. However, it is recommended that teams design their robots to have a ground clearance of at least 1cm in order to cope with slight curvatures of the surface.
Schaut mal rein,

MFG Moritz