FEATURES*Used to remove unwanted reflection from your images. * Get very clear pictures. * Multi-layer coating, anti-oil, anti-dust, waterproof*With clamp, easy for almost all the smartphones.Enjoy the Phone CPL filterPerformance:1: Super high resolutionThe contrast show that the resolution of U-safe Variable ND filter is high definition, the resolution of other brand Variable ND filter is insufficient, and the picture is blurred.2. Ultra-low color shift.From the comparison, we can find that the color shift with ND8 filter is very little.3. Double-side coatingWith double sides nano coating, it is high performance Product NamePhone CPL FilterFunctionRemove unwanted reflective light, help you get clearer pictures.Material (Glass)AG glass / Schott Glass B270Material (Frame)Aluminum Alloy / Ti / Cu / Brass for optionDiameter37mmFrame thicknessAbout 4mmFrame ColorBlack, Gold, Red, Blue for optionCoatingMultiple-layer of vacuum nano coating with AR & AF filmProcess (Frame)CNC , Anodizing, Laser EngravingUsed forSmartphone photographyIf your demands is excluded in above offered specification, it's customizable.