ICE HD 77mm CPL 77 MC Filter Circular Polarizer Hard Coated EZ Clean 16 Layer Multi-Coated Ultra-low reflective coating minimizes reflection off internal CCD & CMOS sensors Metal, double threaded frame to allow additional filters or hoods. Multicoated (16 coatings) optical glass filter. Hard protection: Coating guards from scratches. Under and over coated (both sides)