BTW, I've now tried the pro-window, it's pants.
Bear in mind that this one was from WCW, they told me they have it made to their spec', (which is shocking if true) I don't believe this to be true. They told me it was 11", it isn't it's a full 12". They told me their jets can be fitted in the other holes, they can't, the holes are too big. The brush looks identical in every way to the standard pro-window brush

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It is almost rigid it's that stiff, very poor. If it is indeed made to "their" spec' it leaves me with no confidence in any of their other products. Not that surprised to be honest, but disappointed that big suppliers are still selling total crap! :
