Shiny Nickel coating enhances rust and corrosion resistant. Steel hubs are soldered with the cast-iron core so it is hard for dust, water and silk to intrude the ball bearing and shaft. Thus lessen the needs for maintainance.
PP plastic body is more firm and durable than normal HDPE body. Elastic rubber wheel is very soft (Shore A: 65) will provide noiseless and comfortable feeling. Handle is foldable will not only save space but also easy to carry.