To suit HSP 1/16 scale models. Please check your manual for the correct part number to ensure a fit. Parts are plastic unless otherwise stated in the title. Images copyrighted by BlackSmith Products Ltd. Standard plastic replacement wheels and tyres to fit HSP 1/16 models. Please check measurements before ordering wont fit all 1/16 models. 74mm outer diameter - 51mm inner diameter - 30mm wide - 12mm hex - 19mm depth to hex.