The average level of manufacturing bearings. Uncertain accuracy of surface and gaps between them. Easy to find bearings with different clearances in the joint tube. The difference is palpable, if the shift and tilt of the ring in the bearing. Blueing the surfaces is uneven, it is easily seen in the light. It is good that the bearings without lubrication. It is convenient to use special oil. Rolling is good, but I've used oil with friction modifier. The components of this modifier drastically reduces friction in all bearings ;-) . The bearings in the tubes, but without boxes. Most likely, these bearings (800 pcs for USD$495) are the same as bearings (800 pcs for ~USD$350) they were with yellow seals. I have both, I can compare. Good rubber seals, sitting tight in the bearings. Seals are easily removed for cleaning and lubrication of the bearing. Seals of red, ring is black. The bearings can be used for its intended purpose, the main thing — lubricate before use.
