Features: Aluminum alloy helmet base Motorcycle windshield curved bracket 3M Hero11/10/9; Features: the parts are stable without shaking after being transferred (traditional bases are quick to disassemble, which is easy to break, and quick to disassemble may cause some shaking due to gaps); Curved base especial for helmet outside; CNC aluminum alloy material ，aluminum nut parts. High-quality metal material, suitable for your adventure journey; Please clean the outside and press firmly to make sure the base is firm; Specifications: Base Material:Aluminum Alloy Color:Black Package Includes: 1x Helmet Fixed Mount 1x 3M Sticker 1x Stainless Steel Screw note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.