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Gosen

Polylon PolyBreak 18 (1.20)

Polyester Gauge 18 1.21 mm In production

Lab measurements for Gosen Polylon PolyBreak 18 (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

165lb/in

lower = softer, kinder on the arm

Tension loss

53%

lower = stays where you strung it

Energy return

83%

higher = livelier, more free power

Spin potential

4.8

higher = more spin off the string bed

Ball bite

0.354COF

higher = grabs the ball harder

Snapback

0.074COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 165 lb/in · 33rd pct

Stiffer than 33% of strings tested.

Tension loss 53 % · 93rd pct

Sheds more tension than 93% of strings tested — goes dead fast, expect frequent restringing.

Energy return 83 % · 8th pct

Livelier than 8% of strings tested — very muted and low-powered.

Spin potential 4.8 · 51st pct

More spin potential than 51% of strings tested.

Ball bite 0.354 COF · 3rd pct

Grips the ball harder than 3% of strings tested — slick against the ball.

Snapback 0.074 COF · 11th pct

More string-on-string friction than 11% of strings tested.

Strings that play like this

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

IsoSpeed Pulse 16 98% match Wilson Enduro Tour 17 96% match Poly Star Turbo 16L (1.25) 94% match Wilson Revolve Spin 16 94% match Polyfibre Hexablade 16L (1.25) 94% match Gosen Polymaster II 16 93% match

More from Gosen

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 Polylon PolyBreak 18 (1.20) against 789 strings Find the right string for me