This stem headset sealing gasket is compatible with Sonic Alien. It is a scooter body component made from black rubber, precision-cut to follow the stem headset contour with multiple bolt holes for accurate positioning. The gasket installs between the stem head cover and the main frame opening, sealing the headset cavity against water, dust, and road debris. It connects the stem assembly to the deck body interface, protecting steering bearings, internal wiring, and nearby electrical components. Fitted during stem or headset assembly, it helps preserve internal parts and reduces moisture-related wear over time.