The characteristic is that the load capacity is large for light weight. Urethane winding is quieter than rubber winding. However, because it is a thin type of urethane layer, it is not suitable for shocks such as overcoming steps. Rotation locking is not required only with rotation lock, so careful selection is required. Whether it is suitable for a moving rack or a sub table of DIY in a flooring room. For outdoor use, the one with a large diameter is good.