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Tourna

Quasi-Gut Armor 17

Nylon/Polyester Gauge 17 1.28 mm In production

Lab measurements for Tourna Quasi-Gut Armor 17, 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

144lb/in

lower = softer, kinder on the arm

Tension loss

18%

lower = stays where you strung it

Energy return

93%

higher = livelier, more free power

Spin potential

5.6

higher = more spin off the string bed

Ball bite

0.548COF

higher = grabs the ball harder

Snapback

0.097COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 144 lb/in · 7th pct

Stiffer than 7% of strings tested — exceptionally soft and forgiving.

Tension loss 18 % · 10th pct

Sheds more tension than 10% of strings tested — outstanding tension maintenance.

Energy return 93 % · 81st pct

Livelier than 81% of strings tested.

Spin potential 5.6 · 71st pct

More spin potential than 71% of strings tested.

Ball bite 0.548 COF · 90th pct

Grips the ball harder than 90% of strings tested — bites the ball hard through the brush.

Snapback 0.097 COF · 59th pct

More string-on-string friction than 59% of strings tested.

Strings that play like this

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

Babolat SpiralTek 17 98% match Prince Lightning Pro 16 (1.30) 96% match Tourna Irradiated 17 94% match Solinco Vanquish 17 (1.20) 94% match LaserFibre 1200 16 (1.30) 94% match Tecnifibre HDX Tour 17 (1.24) 94% match

More from Tourna

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 Quasi-Gut Armor 17 against 789 strings Find the right string for me