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Kirschbaum

Pro Line II 17L (1.20)

Polyester Gauge 17L 1.20 mm In production

Lab measurements for Kirschbaum Pro Line II 17L (1.20), 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

193lb/in

lower = softer, kinder on the arm

Tension loss

46%

lower = stays where you strung it

Energy return

86%

higher = livelier, more free power

Spin potential

4.8

higher = more spin off the string bed

Ball bite

0.436COF

higher = grabs the ball harder

Snapback

0.090COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 193 lb/in · 61st pct

Stiffer than 61% of strings tested.

Tension loss 46 % · 79th pct

Sheds more tension than 79% of strings tested.

Energy return 86 % · 31st pct

Livelier than 31% of strings tested.

Spin potential 4.8 · 51st pct

More spin potential than 51% of strings tested.

Ball bite 0.436 COF · 48th pct

Grips the ball harder than 48% of strings tested.

Snapback 0.090 COF · 46th pct

More string-on-string friction than 46% of strings tested.

Strings that play like this

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

Gamma Zo Twist 16 97% match Signum Pro Firestorm 1.25 96% match Solinco Barb Wire 17 (1.20) 94% match Head Ultra Tour 16 94% match Kirschbaum P2 17L (1.20) 93% match Signum Pro Poly-Plasma 17L (1.18) 93% match

More from Kirschbaum

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 Pro Line II 17L (1.20) against 789 strings Find the right string for me