The SIRUI Wide Angle Circular Polarizer CPL Filter is the perfect addition to the SIRUI 18-WA Wide Angle Mobile Phone Lens. It can help you to achieve excellent results by reducing reflections (on non-metallic surfaces) and enhancing colors during photo or video shooting. 1. German manufactured Schott Plate Glass B270 with multi-layer Anti-Reflective and Protective Coating for high image quality. 2. Finest quality polarizing filter, with nearly 100% polarization. 3. Neutral color transmission for accurate color reproduction and UV reduction. 4. Lightweight, high performance "scientific grade" aluminum filter ring provides high strength, corrosion resistance, stability and critical filter alignment. 5. Designed for use with the SIRUI 18-WA Wide Angle Mobile Phone Lens.