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I can't find the rubber on tibhar.com nor TT11. Have you got some more info?
Maybe it is only for Chinese market as a no-need-to-boosting tacky rubber option?
You can read the latest K1 PRO review here:
https://translate.google.com/transl...orum.php?mod=viewthread&tid=868509&edit-text=
some other info here (you might need google translate)
http://www.yoger.com.cn/product/145035.html
http://www.yoger.com.cn/product/147066.html