Cast Iron, Aluminium drum,SBR and NBR 1.hard, flexible,adaptable ... concentricity, the wear-resisting performance is good. It makes the machine to reduce the load vibration, and to increase the rubber ... .5±0.5ColorwhiteHardness Shore A90-95degreeBrandRoaring Lion, QiaoWang,Yashi,OEM cast drum,aluminum drum,rice processing machine rubber roll