Hubba represents the latest innovation in wheel technology. The cores of Hubba wheels are computer designed and utilize a reinforced polyurethane compound, enabling the core to adhere to the outer urethane layer. They call these cores "hubs". Since the hub and the outer riding surface are both made of urethane, the two elements bond together seamlessly. Furthermore, hubs are radically lightweight and redirect the wheel's inertia to the outer riding surface, helping you ride at a rapid rate.