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.