Excellent tennis ball for a fair price The combination of natural rubber and woven English felt guarantees a maximum of performance and durability with the Balls Unlimited Code Black. It is the top product of the Balls Unlimited range. This is also confirmed by the German tennis magazine Balltest 08/2014. It lasts at least 20% longer than any other brand balls tested. The Balls Unlimited Code Black is ITF approved and thus meets all the qualitative requirements for use in tournaments. Discover that excellent tennis balls do not have to be expensive - with the Balls Unlimited Code Black! Highlights: Premium felt for excellent bounce properties suitable for training and tournaments (ITF approved) awarded test winner extremely durable