Tecnifibre NRG2 1.24mm 200m ReelThe NRG has been designed with a special purpose in mind: to be the engine of the racquet! This is the primary meaning of NRG, the most powerful string in the range. A specific construction of more than 1200 microfilaments, made of Elastyl (12% more elastic than standard polyamide). Impregnated with 400 polyurethane to generate power and comfort. And finally, the exclusive S. P. L surface treatment to provide slip and effective snap back so you don't
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