608 are standard ball bearings are mainly used for inlineskates (outer diameter 22mm, center 8mm, headroom 7mm). To our opinion this maintenance-free ball bearings provide a perfect running without additional lubrication. These ball bearings are lubricated with an operating life grease. After approximately 100 km of run-in the grease is totally spread. Besides that these bearings achieve a perfect running for an unbeatable price.
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