... 2inch-6inchType: screw caster-activity typeMaterial: rubber, nylon, polyurethane and so on.Characteristics: Wear-resisting, small ... 632040RubberBallM1086Nylonpolyurethane 802350RubberBallM12100Nylonpolyurethane 1002660RubberBallM12128Nylonpolyurethane 1252870RubberBallM16150Nylonpolyurethane 1603285RubberBallM20200Nylonpolyurethane material: nylon caster material:polyurethane material: rubber ...