1)Material:TPR wheel with pp core,zinc plated 2)Diameter:75-125mm 3)Load capacity:30-80kg 4)Installation height:90-155mm 5)Bearing:roller bearing or ball bearing 6)Passed the evaluation of ISO 9001:2000 quality system certification 7)Application:trolleys,household apparatus,rack,handcart,medical instruments,etc High quality and sells well in different markets.