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this ball surface is some glossy which anti to get wet, many other ball surface is rough so water stick to surfaces easy.
compare to Donic 40+poly, Buttlefly 40+poly longer bouncing time and some sound tick pitch which Donic doesn't, but when playing Buttlefly's ball feel heavier. Haven't try Nittaku 40+poly yet, it's hard to find seller in my nearly local area. Buttlefly 40+poly always my first choice.