I bought these to build spinners with my 3D printer. At first I was disappointed because they didn't spin very long, but then I realized that the grease they use to seal the bearing (which they do really well) slows it down. After degreasing and running dry (or with a shot of WD-40) they turn very well; and that's a great price for you. The only downside is that the plastic piece that holds the bearings in place isn't very precise and often doesn't center properly, and the red plastic dust caps don't have that precise shape. as I like (sometimes rubs against the middle). BUT again the price is great and if these two things got fixed and the price stayed about the same I would definitely be yelling at the manufacturer to take my money.
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