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Royal Blue was a color reserved for athletes sponsored by Kogel Bearings, but now it is available to us mere mortals. The narrow-wide tooth profile on the top pulley helps to retain shifting accuracy by pushing every link of the chain. The quality of the ABEC 5 full ceramic bearings is Grade 3, one of the best. Grade 3 means that the ball has a 3/1,000,000” tolerance of sphericity which means it is extremely round, which means less friction and that the Grade 3 balls roll a longer duration than others.