Name: Babolat Tonic + Natural Gut 16
Brand: Babolat

Measured values

Stiffness

99lb/in

lower = softer, kinder on the arm

Tension loss

15%

lower = stays where you strung it

Energy return

96%

higher = livelier, more free power

Spin potential

—

not measured

Ball bite

—COF

not measured

Snapback

—COF

not measured

How it ranks against all 789 strings

Stiffness 99 lb/in · 2nd pct

Stiffer than 2% of strings tested — exceptionally soft and forgiving.

Tension loss 15 % · 4th pct

Sheds more tension than 4% of strings tested — outstanding tension maintenance.

Energy return 96 % · 99th pct

Livelier than 99% of strings tested — huge free power off the string bed.

Stiffness · lb/in

How much the string bed resists deflection. Higher plays firmer and more controlled; lower plays softer and easier on the arm.

Tension loss · %

Share of the reference tension the string sheds under a fixed test protocol. Lower means the bed stays where you strung it for longer.

Energy return · %

Share of impact energy handed back to the ball. Higher plays livelier and more powerful.

Spin potential

Ball friction divided by string-on-string friction. Higher means better bite with a cleaner snapback, so more spin.

Ball bite · COF

String-on-ball friction. Higher grabs the ball harder through the brush.

Snapback · COF

String-on-string friction. Lower lets the mains slide and snap back into place after impact.