ABS plastic frame is durable against external forces. Also wear and tear, water and detergents. The wheel has a unique locking system that is very beautiful and the operating force is significantly lighter than similar products. Rubber treads are soft, ride smoothly, non-marking and make less noise.

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..