Just acceptable quality: steel bracket is thin and average wheel quality. The caster is not too durable as it has only one ball bearing raceway in swivel head so if overload or by foreign force the bearing ball may fall out.

Quite a bargain. Grey TPR wheel is better than the usual Magenta PVC Caster. It is cushion, tear and wear resistant. With ball bearings and hubs, it creates no noise, requires less labor when operating. The dust proof ring and plastic cover clear the fear of fiber, hair will stuck the wheel. Most suitable on wood tile floor.

Single precision bearing helps the wheel roll mute & smoothly. The caster can rotate at ease, thanks to it's double bearing raceways. Plastic bearing hubs help prevent dust and silk intrude inside the core - thus increase its lifetime.

Conductive rubber tread materials offer excellent electrical discharging throughout the tread and across the whole contact surface. The steel bracket is Zinc coating so the whole caster is electrical conductive. The caster will then producing a continuous and safe discharging to ensure the safety of electronic devices.