J-pen why not RPB?

Why don't Jpen users use RPB? What is the reason? Why do only Cpen users using RPB?

nobody knows?

Why is square too hard to RPB?

Chinese use Cpen for RPB while Korean players use Jpen without RPB. I am sure there is a reason.

How much thicker is it compared to a shakehand blade?

PingPangQiu wrote: Chinese use Cpen for RPB while Korean players use Jpen without RPB. I am sure there is a reason.

Yes, but you can remove the cork to put rubber on.

silvalis wrote: I think it has more to do with the playing distances between cpen and jpen.

I think silvalis has the most plausible reason there.  Most of professional and top JPen players execute their powerful FH loops ranging from close to table and most of the time at mid distance.  This gives them that extra split second to set up for such shot, compared to those CPen players that loop over the table.  The downside is the JPenners get drawn away from the table leaving their FH side unprotected.  But good JPenners such as RSM and KTS can compensate that drawback with good and fast footwork to a certain degree.

Personally I think if the next generation of top JPen players would likely use RBP and that will make their game more complete and give them the much needed longevity beyond the current JPenners who usually peak in their mid-20s and die down before they reach mid-30s of age.

Does this generally make them better as they do lose a few point from their weak blocking backhand?

I don't think J-peners need the rpb. If you look at Kim Taek Soo his regular backhand was very powerful and aggressive.

That didn't stop Kim.

When using jpen the reason for the square head is so that the entire blade is head heavy, thereby increasing momentum and speed of racket so you generate that powerful shot. Because the forehand is technically the strongest shot in the game thats why jpen-ers go for a very aggressive fh oriented game.
However, adding another piece of rubber on teh backside makes it much too head heavy. I've tried it and you actually experience a loss in swing speed for the fh just because it has become heavier. This just negates the advantage of a jpen's extra-strong forehand and then you might as well play cpen, which has a circular head to maintain weight balance throughout the blade to play a more stable and consistent game.

i have seen some jpens for sale that are for rpb

In fact, it doesn't matter whether to use cpen or jpen for RPB.

I think off table Jpen RPB is completely possible and even necessary.