What voltage?
Moderate tension (18kg to 23kg) gives you more comfort, more effect and more power, but less control and precision. On the other hand, you'll have less control and precision.
High tension (>23kg) gives you more precision and control. But beware of tendonitis. You'll also get less spin and power.
Monofilaments?
For monofilament ropes, Decathlon recommends tensions between 19kg and 22kg. To avoid injury, we strongly advise against monofilament strings for children under 15. These strings are reserved for players who break in less than 10 hours of play, as they lose their tension very quickly (20% loss after 3 hours of play).
Multifilament?
For multifilament strings, Decathlon recommends a maximum tension of 25kg! These strings are recommended for people sensitive to tendonitis, young people and those who break little. Multifilament ropes keep their tension very well and remain dynamic for a long time.