Given some of the negative reviews I think I was lucky because 12 of the 13 pulleys I received were perfect. The 13 was mostly good except for a very small scratch on the POM wheel. All pulleys turn very easily and the fit and finish of the POM and bearings is very good, I don't feel any play. They also contain an important spacer between the ball bearings. This spacer prevents the bearings from seizing when tightening the fasteners. In general a good buy.
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