Center control caster Wheel material:TPR tyre,PP core Loading weight:90-110kg Size:4"-6" Wheel material: TPR tyre,PP core Bracket options:Double ball path frame,high quality armor plate,rivet. Color:GreyBracket selection:1.Double Ball path heat treatment,boost up use.2.Finish: Zinc plated3.soleplate to orderInstallation fashion:Zinc plated center control fork Center control caster