ULTRAVIOLET PROTECTIVE FILTER [UV] – Prevents Loss of Sharpness & Contrast by Filtering Out UV Rays & Haze; Allows for High Light Transmittance While Protecting Lens Against Scratches, Scuffs & Smudges CIRCULAR POLARIZER FILTER [CPL] – Uses Polaroid Patented Technology for ‘On Location’ Control of Color Saturation; Make Blue Skies Bluer, Green Grass Greener & Eliminate Reflections from Glass & Water NEUTRAL DENSITY FILTER [ND9] – Prevents Overexposure by Reducing the Passage of Light Through the Lens in Bright Conditions; Retain Balanced Color & Optimal Focus for Landscapes & Outdoor Photography PRO-GRADE MC FILTERS;– Polaroid Optic Filters use Pro grade Multi-Coated Glass Which Gives You Unparalleled Quality. Included is a Water-Resistant Nylon Carry Pouch to Protect the Filters COMPATIBLE WITH ALL 40.5MM LENSES – To Ensure Perfect Fit, True Color, Optimal Saturation & Zero Detail Loss, Verify Lens Thread Size Based on “Ø40.5” Marking on Lens Barrel or Underneath Lens Cap