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Poly Star

Energy 17 (1.20)

Polyester Gauge 17 1.23 mm In production

Lab measurements for Poly Star Energy 17 (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

64%

lower = stays where you strung it

Energy return

77%

higher = livelier, more free power

Spin potential

4.0

higher = more spin off the string bed

Ball bite

0.366COF

higher = grabs the ball harder

Snapback

0.092COF

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 64 % · 99th pct

Sheds more tension than 99% of strings tested — goes dead fast, expect frequent restringing.

Energy return 77 % · 1st pct

Livelier than 1% of strings tested — very muted and low-powered.

Spin potential 4.0 · 30th pct

More spin potential than 30% of strings tested.

Ball bite 0.366 COF · 7th pct

Grips the ball harder than 7% of strings tested — slick against the ball.

Snapback 0.092 COF · 50th pct

More string-on-string friction than 50% of strings tested.

Strings that play like this

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

Poly Star Classic 17 (1.20) 99% match Polyfibre TCS 16L 97% match Poly Star Energy 16 (1.30) 96% match Poly Star Energy 16L (1.25) 96% match Polyfibre Poly Hightec 16/1.30 95% match Head Sonic Pro 16 95% match

More from Poly Star

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 Energy 17 (1.20) against 789 strings Find the right string for me