1. Made of optical tempered glass material, with a hardness of 10H and good transparency. 2. The transmittance of the lens material is close to 92%, and an AR coating layer is applied to increase the transmittance of the lens to over 98%. 3. The lens is coated with a waterproof film layer, with a drip angle of 115 degrees, and there are no residual water droplets on the surface of the lens that affect the shooting effect. 4. Adopting a screw on installation method, the installation and disassembly are simple and convenient. Applicable model: For insta360 X4 Air premium glass protective mirror. Features: Scratch resistant, anti fog, dust-proof, high temperature resistant. Net weight of product: 4.2g. Hardness: 10H. Lens Material: Optical Tempered Glass. Bracket material: High quality PC. Transmittance: 98%. Size: 33 * 32 * 12mm. Packing List: 2 * Advanced Glass Protective Mirrors 2 * Alcohol Cotton pads