Mold on rubber on steel on wheelWheel Material:robber/SteelFeatures as below:Cushion rubber tread on cast iron center.Floor protection,shock absorbent.Zerk fitting in hub for lubrication.Roller bearing for easy handle the heavy loads.Durometer:80+/-5 shore A.OEM and ODM orders are welcome.12 years of export experience, professional manufacturing technology, and a strict quality control system.