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Butterfly Tenergy *5 FX rubber with Softer Spring Sponge.
Tenergy has proved to be an outstanding success, combining High Tension Technology with Spring Sponge .Tenergy has risen to the top of the charts.
Now there is a further development which maintains high performance levels with greater control. Tenergy **-FX combines High Tension Technology with a softer version of Spring Sponge. **-FX is the perfect answer for players who seek heavy topspin and superb control.