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Signum Pro

Poly Plasma 17 (1.23)

Polyester Gauge 17 1.27 mm In production

Lab measurements for Signum Pro Poly Plasma 17 (1.23), 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

198lb/in

lower = softer, kinder on the arm

Tension loss

26%

lower = stays where you strung it

Energy return

88%

higher = livelier, more free power

Spin potential

5.4

higher = more spin off the string bed

Ball bite

0.483COF

higher = grabs the ball harder

Snapback

0.089COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 198 lb/in · 67th pct

Stiffer than 67% of strings tested.

Tension loss 26 % · 38th pct

Sheds more tension than 38% of strings tested.

Energy return 88 % · 44th pct

Livelier than 44% of strings tested.

Spin potential 5.4 · 67th pct

More spin potential than 67% of strings tested.

Ball bite 0.483 COF · 71st pct

Grips the ball harder than 71% of strings tested.

Snapback 0.089 COF · 44th pct

More string-on-string friction than 44% of strings tested.

Strings that play like this

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

Yonex Poly Tour HS 16L (1.25) 95% match Topspin Cyber Whirl 17 (1.24) 95% match Tourna Black Zone 16 94% match Gamma Zo Dart 17 (1.25) 94% match Pacific XCite 16L (1.25) 94% match Boris Becker Bomber NYC 17 (1.23) 93% match

More from Signum Pro

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 Poly Plasma 17 (1.23) against 789 strings Find the right string for me