Especially for cycling, this range with a high quality is perfect to resist to the most extreme circumstances. Each component (balls, rings, cages and grease) is manufactured and assembled with precision. A Black Bearing B5 bearing is synonym of reliability, fluidity and durability. It is the most sold bearing of the range and 100% compatible to replace the original bearings. Chrome steel balls SAE52100 abec 5. Steel rings SAE52100 with optimized internal design. Chrome steel cage. Reinforced« 2RS » seals for better water and dust resistance. High quality grease. Marca BLACK BEARING Referencia de proveedor UB-6202-B5 Estilo 6202-2RS Nombre de producto Bearing Tipo B5 Unidades Each