Features: Optical glass, precised grinding and polishing. Adopting double-sided multilayer coating technology. Double sided oil proof and waterproof, providing protections for your lens. The buckle design can be tightly fixed to the lens and will not accidentally fall during flight. Aircraft aluminum frame material, not easy fading. During installation, original lens will not be damaged, and filters can be changed at any time to prevent you from missing out on exciting moment. Specifications: Material: Aluminum alloy (frame)+optical glassType: refer to picture to selection pleaseSize: about 2.3x2.5x0.2cm/0.9x0.98x0.07inchApplicable Model: for Avata 2Package Includes: 1Pc Lens Filternote: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.