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Tecnifibre

Black Code 4S 17 (1.25)

Polyester Gauge 17 1.25 mm In production

Lab measurements for Tecnifibre Black Code 4S 17 (1.25), 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

209lb/in

lower = softer, kinder on the arm

Tension loss

28%

lower = stays where you strung it

Energy return

89%

higher = livelier, more free power

Spin potential

9.8

higher = more spin off the string bed

Ball bite

0.658COF

higher = grabs the ball harder

Snapback

0.067COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 209 lb/in · 78th pct

Stiffer than 78% of strings tested.

Tension loss 28 % · 44th pct

Sheds more tension than 44% of strings tested.

Energy return 89 % · 55th pct

Livelier than 55% of strings tested.

Spin potential 9.8 · 99th pct

More spin potential than 99% of strings tested — elite spin generation.

Ball bite 0.658 COF · 99th pct

Grips the ball harder than 99% of strings tested — bites the ball hard through the brush.

Snapback 0.067 COF · 2nd pct

More string-on-string friction than 2% of strings tested — slides and snaps back freely.

Strings that play like this

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

Solinco Revolution 16L (1.25) 97% match Diadem Solstice Power 16L (1.25) 96% match Babolat RPM Blast Rough 16 96% match MSV Focus-Hex 16 (1.23) 95% match Diadem Solstice Power 16L (1.25) 94% match Weiss Cannon Blue Rock N Power 94% match

More from Tecnifibre

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 Black Code 4S 17 (1.25) against 789 strings Find the right string for me