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The largest re-impact production smart defensive blades are only 168 by 160 mm

This may work for at the table blockers but TOTALLY unacceptable for away from the table choppers in the 40+ mm plastic ball ONLY era

They have to be at least 172 mm by 172 mm

I am not sure if it will work even for at the table blockers
Because the width is smaller than the height

I do not understand where all the manufacturers got this crazy idea somehow that the width has to be much smaller than the length.
The only reason I can think of is that it works for some jkPen attackers.

And I do not understand how it got translated to defensive shakehand blades OMG

I know from my personal experience
Blades with smaller width than length are garbage for any type of defender sorry.