Every size d bearing I’ve ever gotten has always rusted out.
Just use a little thin oil. It should help them from rusting.
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I’ve never noticed a D (or any size bearing) wearing out or rusting, but I live in a fairly dry climate. Thin lube might help or keep your D yoyos in a box with some dessicant.
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I used to say the ones Rcs sold but uhh yeah
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