Set of 20 These are 3D-printed Shibetsu fins, which are optionally available for vehicles like the Toyota Prius. They can be attached to the underpanel of your car with double-sided tape. Double-sided tape is not included, so please prepare it yourself. By attaching multiple sheet-like fins to the underside of the vehicle, the airflow under and behind the vehicle is improved, enhancing driving stability during cornering, straight-line driving, and in crosswinds. Size: 40mm (height) x 80mm (width) x 3mm (thickness) / 4mm including the base