Zomei&reg; Ultra Slim AGC Optical Glass PRO Fader Variable Density Neutral Gray ND X Lens Filter - 58mm Only 7mm thickness, Wide-angle lens compatible ultra thin frame. With Zomei Variable Density Neutral Gray filters, users can select the intensity from ND2 (1 f-stop) to ND400 (8+ f-stops) by rotating the front ring. Glass mounted with high pressure press technology. Original AGC Optical Glass from Japan. All Materials Used in this filter Meet the Requirements of European Union's standards of Environ Ment Protection-ROHS(Restrictions on Hazardous Substances).