Pc Mirror: High Refractive Index and Specific Light Density, Good Light Transmission, Not Easy to Deform, High Hardness, Does Not Pollute the Environment. Features: When Exposed to an External Force, the Lens is Concave, But after the External Force is Released, the Lens Returns to Its Original State. Mirror Back: Made of Pp, Bright and Eye-Catching, with Good Warning Effect. Nature: the Versatile Hat Effectively Protects the Sunlight and Rain Outdoors to Promote Clear Vision and Improve Driving Safety. Features: after the External Pressure is Removed, the Mirror Returns and the Concave Deformation Returns to Its Original State.