StringSpec
String finder

Browse all 789

Kirschbaum

Pro Line II 18 (1.15)

Polyester Gauge 18 1.18 mm In production

Lab measurements for Kirschbaum Pro Line II 18 (1.15), 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

183lb/in

lower = softer, kinder on the arm

Tension loss

46%

lower = stays where you strung it

Energy return

88%

higher = livelier, more free power

Spin potential

4.5

higher = more spin off the string bed

Ball bite

0.435COF

higher = grabs the ball harder

Snapback

0.097COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 183 lb/in · 49th pct

Stiffer than 49% of strings tested.

Tension loss 46 % · 81st pct

Sheds more tension than 81% of strings tested.

Energy return 88 % · 43rd pct

Livelier than 43% of strings tested.

Spin potential 4.5 · 43rd pct

More spin potential than 43% of strings tested.

Ball bite 0.435 COF · 48th pct

Grips the ball harder than 48% of strings tested.

Snapback 0.097 COF · 59th pct

More string-on-string friction than 59% of strings tested.

Strings that play like this

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

Solinco Tour Bite Diamond Rough 17 (1.20) 95% match Gamma Zo Twist 16 93% match Kirschbaum Pro Line II 17L (1.20) 91% match Kirschbaum Competition 17L (1.20) 90% match Weiss Cannon Scorpion 1.22 90% match Signum Pro Firestorm 1.25 90% 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 18 (1.15) against 789 strings Find the right string for me