Babolat VS Tonic + is Babolat's original natural gut.

 

Authentic natural gut: an incomparable, legendary string.
Authentic natural gut strings for maximized power and feel.
To discover the performance of gut strings.
Selection of "Standard grade" materials.

 

Babolat's recommended maximum tension for:

Ball Feel: 135mm 15L 28kg / 62lbs
Longevity: 135mm 15L 32kg / 70lbs