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Dunlop

X-Life Synthetic 15L

Nylon Gauge 15L 1.40 mm In production

Lab measurements for Dunlop X-Life Synthetic 15L, ranked against all 789 strings in the database. Every figure below is a testing-machine result at a fixed reference tension, not a playtest opinion.

Measured values

Stiffness

177lb/in

lower = softer, kinder on the arm

Tension loss

22%

lower = stays where you strung it

Energy return

91%

higher = livelier, more free power

Spin potential

3.5

higher = more spin off the string bed

Ball bite

0.379COF

higher = grabs the ball harder

Snapback

0.107COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 177 lb/in · 44th pct

Stiffer than 44% of strings tested.

Tension loss 22 % · 26th pct

Sheds more tension than 26% of strings tested.

Energy return 91 % · 68th pct

Livelier than 68% of strings tested.

Spin potential 3.5 · 18th pct

More spin potential than 18% of strings tested.

Ball bite 0.379 COF · 12th pct

Grips the ball harder than 12% of strings tested.

Snapback 0.107 COF · 72nd pct

More string-on-string friction than 72% of strings tested.

Strings that play like this

Closest matches across stiffness, tension loss, energy return and spin potential.

Pacific Power Line 17 99% match Prince Recoil 16 97% match Gamma TNT2 16 96% match Wilson NXT Tour 16 96% match Gosen OG-Sheep Micro 16 95% match Head Synthetic Gut PPS 16 94% match

More from Dunlop

What these numbers mean

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.

Compare X-Life Synthetic 15L against 789 strings Find the right string for me