What rubber does the unger ninja use?

looking into the unger ninja

Pretty sure the ninja channel will accept any round top rubber. Unger, ettore, wagtail, black Diamond, facelift, professional squeegee, pulex all make round top rubber.

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https://shopwindowcleaner.com/window-cleaning-tools/replacement-rubber.html

I really like Ettore rubber and always use that as a replacement once the Unger that comes with the channel wears out.

so i know jared once mentioned it but have you all noticed that some rubbers are shorter than others? usually only by a millimeter or so bit it means a long rubber in a short channel or a short rubber in a long channel doean’t work well. I never hear anyone talking about it but it messes with me. ettore and pulex seem to be long while unger and black diamond are shorter, any thoughts?

(this connects to this threat since a ninja would be designed for a short unger rubber and may not work well with a long one)