Mold on Polyurethane onsteel wheelWheel Material:Polyurethane steelFeatures as below:Polyurethane on cast iron center.Floor protection,resistant to most chemicals,oils,acids,grease and water. Roller bearing for easy handle the heavy loads. Durometer:90+/-5 shore A. OEM and ODM orders are welcome.12 years of export experience, professional manufacturing technology, and a strict quality control system.