... : Grey rubber wheel, Cast iron or PP coreBearing: Roller bearing or Steel bushingHardness: 85(±5)ADiameter: Φ75,Φ80,Φ100,Φ ... 10~60 2. ForkMaterial: SteelFinish: Zinc plated, Chrome plated, LacquerLoad Bearing: Double ball racewaysThickness of Fork: 2mm, 2.5mm, 3mm3. ... SlidingExcellent FlexibilityExcellent Water ResistancePoor Grease Resistance Grey Rubber Wheel With Swivel Top Plate And Brake