Optional parts for Gaobabu Calibo windshield. It can be attached to the Calibo windshield later, so it is recommended for those who are already waiting for the Calibo windshield.The curve is tight so that the slide operation is light, and 10 dents are added to reduce the resistance to the main body of the Calibo. Also, there is a hole in the knob so that a chain or clip can be attached.