Mingze polyurethane Mold on aluminium core wheel properties:Material: PU mold on aluminium coreSize: 4" 5" 6" and 8"Bearing: Precision ball bearingHardness: 93ATemperature: -30 to +80Load capacity: 250kgs to 800kgsMingze elastic PU mold on aluminium core wheel properties:Material: Elastic PU mold on aluminium coreSize: 4" 5" 6" and 8"Bearing: Precision ball bearingHardness: 85ATemperature: -30 to +80Load capacity: 250kgs to 800kgsHave different maching frame