Tecnifibre · Current range

Tecnifibre NRG²

Tecnifibre describes more than 1,200 Elastyl microfilaments, polyurethane impregnation and an SPL surface treatment. These explain construction; they do not directly establish a percentage increase in shot speed.

MultifilamentNot published by the manufacturer1.18 / 1.24 / 1.32 mm

Product details

Material: Multifilament
Gauge: 1.18 / 1.24 / 1.32 mm
Construction: multifilament
String cross-section: Not published by the manufacturer
Surface features: Not published by the manufacturer
Surface treatment / coating: Not published by the manufacturer
Product status: Current range
Stock status: Stock not verified

Laboratory measurements

Lower stiffness means less resistance to deformation in this test. Tension loss is measured under a laboratory protocol, not a prediction of playing hours. Spin potential is a friction-based ratio, not ball RPM.

Tennis Warehouse University · 2026-09-08
Tested sample	Stiffness lb/in	Tension loss %	Spin potential ratio
Tecnifibre NRG2 17/1.24Test conditions: 51 lb · Fast (TWU)	164	15.1	3.5
Tecnifibre NRG2 16Test conditions: 51 lb · Fast (TWU)	158.3	18.3	3.2
Tecnifibre NRG2 18 (1.18)Test conditions: 51 lb · Fast (TWU)	150.9	20	2.6

The test tension is not a stringing recommendation. Compare the same gauge and test conditions; the racquet, stroke and stringing method also affect the result on court. On the source page, select All in the material filter to see results for every material.

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Compare samples tested under the same conditions

Up to three products with nearby measured stiffness, matching diameter, material and test conditions. This is a data comparison, not a ranking of suitability.

1.24 mm · 51 lb · Fast (TWU)
Tested sample	Stiffness lb/in	Tension loss %	Spin potential ratio
Tecnifibre NRG2 17/1.24	164	15.1	3.5
Gosen Multi CX 17 (1.24)	149.7	18.1	4.3

What the 12% and 400% figures describe

The manufacturer describes Elastyl as 12% more elastic than standard polyamide and also publishes an elasticity figure for PU 400. Those are material descriptions, not claims that a completed stringbed launches the ball 12% or 400% faster.

SPL is the stated surface treatment. It is relevant to examining friction and string return, but its name is not a measurement of playing spin. Keep the scope of construction details separate from test results.

Two explicitly identified metric gauges

At 51 lb and Fast speed, NRG2 1.24 records 164.0 lb/in stiffness, 15.1% loss and a 3.5 spin-potential ratio. The 1.18 sample records 150.9 lb/in, 20.0% and 2.6. The less-stiff sample also has greater loss in this comparison.

The gauges differ, so neither result represents the other. A separate sample labelled simply 16 remains nominal; it should not be converted by guesswork and averaged into an explicit metric observation.

The questions behind choosing a thin multifilament

Distinguish a need for easier deformation from a need to preserve depth and direction for longer. Judging a thinner gauge only by its initial feel leaves out wear and changes after use.

Test low volleys, short returns and full crosscourt swings separately. A soft sensation in the hand and the ability to reproduce length on frequent shots are related but different assessment items.

SPL does not replace observing wear

Continue inspecting intersection notches, fraying and how the mains return after movement. Contact and sliding can change with use despite a surface treatment.

Keep the exact gauge and hitting time in the stringing record. Your own trajectory, depth and wear observations provide a more direct basis for changing gauge or tension than manufacturing percentages alone.