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Durability of tennis strings
Influence of the diameter of a tennis string
A thin tennis string (1.1 mm - 1.25 mm) brings more spin, more ball feel, more comfort and more elasticity. The big disadvantage is that these strings tear faster and are thus much shorter than thicker strings. From a diameter of 1.25 mm one speaks of a durable string.
String Tension
The stringing hardness depends on various factors: the choice of string, the racket model and the skill level of the respective tennis player. The most important factors are the stringing pattern and the club head size.
Since natural gut and multifilament strings are relatively elastic and quickly lose their elasticity, they are usually covered harder than other strings. Co-polyester strings do not have to be stringed as hard because they do not lose elasticity so quickly.
Rackets with a large face and a thick profile are usually covered with a higher string weight than clubs with a thin profile.If the balls often fly out or lose control of the racket, the racket is probably too soft. A high string weight promotes the control of the ball.
It is best to get advice on the stringing hardness from a specialist.
String care for a long life
The life of a string depends not only on the choice of the string, but also on the way the player plays and cares. Harmful to the string are heat, sunlight, cold, moisture and broken eyelet bands. Extreme heat and strong sunlight causes a decrease in the tension, so especially artificial strings should be protected from heat. Strong sunlight puts heavy strain on strings. They become inelastic and increase the risk of suffering under a tennis elbow.
The tennis bag should, if possible, be overshadowed where the thermal insulation, which is sewn into most tennis bags, does not get too hot. Cold can make the clothing hard and lead to a tennis elbow. For this reason, especially in winter tennis rackets should be kept with a synthetic string at room temperature. In light rain or a freshly blown up place the clothing should be dried well and at best be sprayed with some string spray or oil. Important: This is especially true for natural gut sites.

When should you string the racket again?
How long a string will maintain its optimal playing behavior depends on various factors such as string type, string tension, style of play, weather conditions, etc.

Rule of thumb: As often as the racket is played per week, the stringing should be renewed per calendar year. Exceptions are monofilaments/polyester strings, which have a maximum playing time of 5-6 hours.