Roller/Pulley Assembly

Carriage Roller, Housing Roller, Plastic Housing Roller Set, Steel Housing Roller Set, Zinc/Aluminium Housing Roller Set, Plastic Roller: POM/ PP/ PA6/ PA66/ Nylon/ PVC/ PU/ ABS and etc + Ball Bearing/ Non-Standard Bearing or without any Bearing.  Housing Frame/Cover: Plastic/Stainless Steel/Aluminium Alloy/Iron with Zinc Plating and etc.