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Head

Hawk Power 17 (1.25)

Polyester Gauge 17 1.30 mm In production

Lab measurements for Head Hawk Power 17 (1.25), 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

204lb/in

lower = softer, kinder on the arm

Tension loss

48%

lower = stays where you strung it

Energy return

82%

higher = livelier, more free power

Spin potential

7.5

higher = more spin off the string bed

Ball bite

0.545COF

higher = grabs the ball harder

Snapback

0.073COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 204 lb/in · 71st pct

Stiffer than 71% of strings tested.

Tension loss 48 % · 85th pct

Sheds more tension than 85% of strings tested.

Energy return 82 % · 6th pct

Livelier than 6% of strings tested — very muted and low-powered.

Spin potential 7.5 · 95th pct

More spin potential than 95% of strings tested — elite spin generation.

Ball bite 0.545 COF · 90th pct

Grips the ball harder than 90% of strings tested.

Snapback 0.073 COF · 9th pct

More string-on-string friction than 9% of strings tested — slides and snaps back freely.

Strings that play like this

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

Kirschbaum Spiky Shark 17 95% match Yonex Poly Tour Drive 16L (1.25) 94% match Prince Tour XR 15L (1.35) 94% match Luxilon Element Soft IR 1.27 93% match Volkl Cyclone 16 93% match Volkl V-Square 16 (1.30) 92% match

More from Head

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 Hawk Power 17 (1.25) against 789 strings Find the right string for me