3 piece filter kit from Vivitar includes UV, CPL, and ND8 filters. Filters are constructed from high quality optical glass and nested in an Aluminum Alloy frame for maximum clarity and vivid picture. UV, or Ultraviolet Filter is a general use, clear filter. It absorbs ultraviolet light, eliminates haze, and reduces bluish casts of daylight. UV filters serves as permanent lens protection agains dirt, dust and stain. CPL, or Circular Polarized Filter, filters out Polarized light reducing reflection from non-metallic surfaces, increasing the contrast, enhancing color and eliminating haze. With Digital Tulip Lens Hood + 3 Piece Cleaning Kit