I use either genuine Kyosho carbide or the balls MicroTech Racing supply, never had smoother diffs!!
The advantages as stated are smoother and longer lasting diffs, the advantage is really felt (more so than on some other brands) on the Kyosho car as the stock diff balls although very good in terms of roundness are softer than ideal. Shame as all the other Kyosho parts are superb quality!!!
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