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Prince

Synthetic Gut 18 Duraflex

Nylon Gauge 18 1.20 mm In production

Lab measurements for Prince Synthetic Gut 18 Duraflex, 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

162lb/in

lower = softer, kinder on the arm

Tension loss

19%

lower = stays where you strung it

Energy return

92%

higher = livelier, more free power

Spin potential

3.6

higher = more spin off the string bed

Ball bite

0.374COF

higher = grabs the ball harder

Snapback

0.104COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 162 lb/in · 28th pct

Stiffer than 28% of strings tested.

Tension loss 19 % · 16th pct

Sheds more tension than 16% of strings tested.

Energy return 92 % · 72nd pct

Livelier than 72% of strings tested.

Spin potential 3.6 · 21st pct

More spin potential than 21% of strings tested.

Ball bite 0.374 COF · 10th pct

Grips the ball harder than 10% of strings tested — slick against the ball.

Snapback 0.104 COF · 68th pct

More string-on-string friction than 68% of strings tested.

Strings that play like this

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

Volkl Power-Fiber II 16 95% match Wilson Sensation 17 95% match Dunlop S-Gut 16 (1.32) 94% match Gamma Asterisk 16 94% match Babolat Xcel Power 16 94% match Kirschbaum Touch Multifibre 17 (1.25) 94% match

More from Prince

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 Synthetic Gut 18 Duraflex against 789 strings Find the right string for me