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IsoSpeed

Energetic Plus 16

Nylon/Polyester Gauge 16 1.30 mm In production

Lab measurements for IsoSpeed Energetic Plus 16, 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

155lb/in

lower = softer, kinder on the arm

Tension loss

22%

lower = stays where you strung it

Energy return

90%

higher = livelier, more free power

Spin potential

2.4

higher = more spin off the string bed

Ball bite

0.410COF

higher = grabs the ball harder

Snapback

0.169COF

lower = strings slide and snap back

How it ranks against all 789 strings

Stiffness 155 lb/in · 18th pct

Stiffer than 18% of strings tested.

Tension loss 22 % · 27th pct

Sheds more tension than 27% of strings tested.

Energy return 90 % · 63rd pct

Livelier than 63% of strings tested.

Spin potential 2.4 · 4th pct

More spin potential than 4% of strings tested — minimal spin generation.

Ball bite 0.410 COF · 29th pct

Grips the ball harder than 29% of strings tested.

Snapback 0.169 COF · 96th pct

More string-on-string friction than 96% of strings tested — notches badly and stays put.

Strings that play like this

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

Head RIP Control 16 98% match Babolat Attraction 16 95% match Gamma Professional 16 94% match Tecnifibre TGV 16 94% match Tecnifibre Multi-Feel 16 94% match Head Fibergel Power 17 93% match

More from IsoSpeed

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 Energetic Plus 16 against 789 strings Find the right string for me