The training ball at top level The HEAD No.1 is the perfect training solution by ambitious tennis players in preparation for competitions. Thanks to the special Encore technology, the ball is particularly durable. This benefits training. The SmartOptik felt ensures that you can keep an eye on the HEAD No.1 Trainer at all times - for effective training. Get the HEAD No.1 Trainer (pack of 4) - ideal for training in the best conditions! Highlights: ideal bounce properties excellent durability thanks to Encore technology SmartOptik felt for increased visibility perfect for team and performance training