For a complete game of high standard The Isospeed Professional combines the playing feeling of a natural gut string with the most modern technology. The Austrian manufacturer Isospeed has specialized in combining the advantages of natural gut and synthetic strings. The result has won many supporters throughout all levels of play. The secret of the arm-friendly Professional lies in the free movement of the polypropylene fibres in the centre of the string and the welded outer coating. This guarantees not only stable playing characteristics but also for excellent arm friendliness. The factory pretension procedure makes the string tension stable and durable Get to know the comfortable and effective playing experience of the Isospeed Professional! Highlights: particularly arm-friendly string recreated natural gut string structure minimal loss of tension due to factory pre-stretching extremely durable optimum cushioning