| Housing: | Pressed steel, double ballrace swivel Zinc plated,Dust-proof seal |
| Wheel: | Elastic rubber sandwiched in nylon Roller bearing,shock absorbant Durable,good wear resistant |
| Housing: | Pressed steel, double ballrace swivel Zinc plated,Dust-proof seal |
| Wheel: | Elastic rubber sandwiched in nylon Roller bearing,shock absorbant Durable,good wear resistant |