Tensor

So is this a good thing and if it is then u doesn't tenergy do this.

Butterfly calls its tensor rubbers "H Tension". Maybe there's a patent on this, but it's certainly more or less the same principle as all the other tensor rubbers. The trouble with this technology, which is supposed to reproduce the effects of the now banned speed glue, is that its effect doesn't last. Sometimes it can vanish very rapidly, like in a couple of months. So if you don't need maximum speed and you're on a budget, prefer the non-tensor rubbers, like the Yasaka Mark V for example. I also don't like the "trampoline" effect of some tensor rubbers (non-linear response from soft to harder hits) that makes them less predictable than regular rubbers.