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Signum Pro

Poly-Plasma Pure 17L (1.18)

Polyester Gauge 17L 1.19 mm In production

Lab measurements for Signum Pro Poly-Plasma Pure 17L (1.18), 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

196lb/in

lower = softer, kinder on the arm

Tension loss

44%

lower = stays where you strung it

Energy return

85%

higher = livelier, more free power

Spin potential

—

not measured

Ball bite

0.391COF

higher = grabs the ball harder

Snapback

—COF

not measured

How it ranks against all 789 strings

Stiffness 196 lb/in · 64th pct

Stiffer than 64% of strings tested.

Tension loss 44 % · 75th pct

Sheds more tension than 75% of strings tested.

Energy return 85 % · 20th pct

Livelier than 20% of strings tested.

Ball bite 0.391 COF · 18th pct

Grips the ball harder than 18% of strings tested.

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 Pure 17L (1.18) against 789 strings Find the right string for me