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R188 Ceramic Ball Bearing is good for DIY your own fidget spinner toys. The 10 Silicon Nitride black ceramic balls allow for a smoother and more stable spinning experience. With this bearing, most fidget spinner can spin 5 minutes at a time with just one whirl. Size: R188 (ID=1/4" OD=1/2" H=3/16") Absolutely this bearing will greatly enhance your spinner.
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