Remove some weight and add some durability to your M-chassis car with these components, which combine wheel axle and hub in one aluminum component!• One-Piece Aluminum Axle/Hub x2• Hard anodized coating for superior durability.• These components are half the combined weight of the kit standard metal axle and a 5mm plastic wheel hub.• Use the included spacers to adjust tread to the same values as those achieved when using 4mm, 5mm and 6mm wheel hubs.• Compatible with M-05, M-06, M-07 and M-08 Concept chassis cars.