Product FeaturesTypical sleeve-type friction accumulation, where the accumulation force is related to the load.The key bearing assembly is composed of precision ball bearings and plastic inner and outer sleeves. This design is not only aesthetically pleasing, but more importantly, makes the roller run quieter.The plastic end caps at the ends of the roller are designed to prevent dust and splashing water from damaging the bearings to some extent.Steel sprockets are used as driving elements, making them more durable.Applicable temperature: -5℃ ~ +40℃.