Wheel surface hardness is Shore A: 95±2 so the wheel can help reduce noise when operating. Plastic hubs helps reduce dust, water, silk goes into its Single precision bearing. Thus longer caster's lifetime with less maintenance.

Conductive rubber tread materials offer excellent electrical discharging throughout the tread and across the whole contact surface. The steel bracket is Zinc coating so the whole caster is electrical conductive. The caster will then producing a continuous and safe discharging to ensure the safety of electronic devices.

Harm of static electricity to humans: With a very large amount of charge on the surface of an object, creating an extremely strong magnetic field in the surrounding environment, in the long term, will affect human health, especially the system. nervous system, genitourinary system, circulatory system..