A scooter headset is a set of 2 large bearings and possibly. cups and shims belonging to it. The bearings are located at the top and bottom of the deck's head tube so that the fork can rotate freely. These balls may be open or closed. We always recommend closed bearings for your headset. The headsets for the impeller can be further integrated or non-integrated in the deck. This depends on whether the bearing is placed directly in the head tube (integrated) or if metal cups are required that hold the bearing (non-integrated).