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Topspin

Cyber Flash 17

Polyester Gauge 17 1.25 mm In production

Lab measurements for Topspin Cyber Flash 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

159lb/in

lower = softer, kinder on the arm

Tension loss

55%

lower = stays where you strung it

Energy return

83%

higher = livelier, more free power

Spin potential

4.2

higher = more spin off the string bed

Ball bite

0.430COF

higher = grabs the ball harder

Snapback

0.103COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 159 lb/in · 24th pct

Stiffer than 24% of strings tested.

Tension loss 55 % · 94th pct

Sheds more tension than 94% of strings tested — goes dead fast, expect frequent restringing.

Energy return 83 % · 11th pct

Livelier than 11% of strings tested.

Spin potential 4.2 · 35th pct

More spin potential than 35% of strings tested.

Ball bite 0.430 COF · 44th pct

Grips the ball harder than 44% of strings tested.

Snapback 0.103 COF · 67th pct

More string-on-string friction than 67% of strings tested.

Strings that play like this

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

Head Sonic Pro 16 97% match Polyfibre Poly Hightec 17 95% match Polyfibre TCS 17 95% match Polyfibre TCS Rapid 16L/1.25 95% match Head Sonic Pro 17 94% match Polyfibre Hightec Premium 17 94% match

More from Topspin

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 Cyber Flash 17 against 789 strings Find the right string for me