The Fort Max TP KNLTB from Dunlop is the official competition ball of the KNLTB forcompetitions and tournaments. The yellow ball is particularly visible thanks to the fluorescent felt and comes with the special KNLTB print. The ball has a carbon core for extra durability. The Fort Max TP is recommended by the KNLTB because this tennis ball has the ideal and most stable flight. In addition, the Fort Max TP has the most consistent bounce. It is the most popular ball on the Dutch tennis courts!