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Gamma

IO Soft 16 (1.28)

Polyester Gauge 16 1.31 mm In production

Lab measurements for Gamma IO Soft 16 (1.28), 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

200lb/in

lower = softer, kinder on the arm

Tension loss

34%

lower = stays where you strung it

Energy return

89%

higher = livelier, more free power

Spin potential

6.1

higher = more spin off the string bed

Ball bite

0.419COF

higher = grabs the ball harder

Snapback

0.069COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 200 lb/in · 69th pct

Stiffer than 69% of strings tested.

Tension loss 34 % · 55th pct

Sheds more tension than 55% of strings tested.

Energy return 89 % · 55th pct

Livelier than 55% of strings tested.

Spin potential 6.1 · 81st pct

More spin potential than 81% of strings tested.

Ball bite 0.419 COF · 37th pct

Grips the ball harder than 37% of strings tested.

Snapback 0.069 COF · 4th pct

More string-on-string friction than 4% of strings tested — slides and snaps back freely.

Strings that play like this

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

Signum Pro Yellow Jacket 17g (1.22) 97% match Gamma Moto Soft 16 (1.29) 95% match Gamma IO 17 (1.23) 95% match Dunlop Black Widow 18 (1.21) 95% match Prince Tour XC 17L 94% match Solinco Revolution 18 (1.16) 94% match

More from Gamma

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 IO Soft 16 (1.28) against 789 strings Find the right string for me