Double ball bearings help the caster rolls very smoothly. Overall quality is much better than those cheap China casters. This TPU wheel can help reducing noise when operating.

You'll feel so confident to bear nearly heavy duty with these casters. Thick strong & solid Nylon wheel with a firm steel bracket will make things lightly.

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..