These are Aluminum Hex Wheel Hubs for the T-Maxx and E-Maxx Truck Kits.
Machined 6061 T-6 aluminum construction.
Packaged in foam, on a bubble sealed header card.
Four Hex Wheel Hubs
Four 2.5 x 10mm Axle Pins
Assembly onto the truck.
Inner Diameter: 6.3mm