These low-cost medium-duty castors manufactured in Spain. Have a high-grade white polypropylene centre with an injected red polyurethane tread and includes double ball bearings. A highly resistant pressed steel bracket (gloss zinc plated). It is non-marking, has a high abrasion resistance, very good dampening with a low rolling resistance. These castors can carry high loads especially at lower speeds and are resistant to many diluted acids, alkalis, oils and greases