PURE Harmonie filters are the thinnest and the lightest in the world. With a thickness of 3.3mm for the Multi-Coated Anti-UV (UV MC), 4.5mm for the Circular Polarizer (C PL) and 9.5mm for the Variable Density Neutral Gray (ND X) they are almost invisible when mounted on your lens. Their weight is so light that you won’t even notice that they are attached. They have been engineered with no compromise: very robust, compatible with all lens caps and multi-coated with EVERCLEAR 5 Coating Technology to withstand almost any conditions. Super lightweight for maximum AF performance and ultra-shallow profile to prevent vignetting. They are just perfect. They are PURE.