The steel-wire reinforced heavy duty twin castors in the DS series are made from a high quality elastic solid rubber with smooth rolling quality and a hardness of 65 Shore A. The wheel centre is made of a rugged welded steel construction and features a grease nipple and a double welded tubular steel hub. The black tread provides excellent operational comfort and has very good floor preservation properties. The wheels in the DS series are specially designed for speeds up to 16 km/h and heavy loads.