Equipped with double ball bearing and PU tread wheel so the wheel will roll silently and smoothly. You can remove plastic hubs and spanner to fit bigger shaft than the 12mm default shaft.
Has high quality as the rubber wheels are made by one of the most knowledge and biggest rubber wheel manufacturer of Vietnam. The rubber is very well-made: cushion and durable. In normal cases, they are said to be used for 2 - 3 years continuously.