UV Protective Filter: Prevents loss of sharpness and contrast by filtering out UV rays and Haze. Protects Lens from scratches, scuffs and smudges CPL Circular Polarizer Filter: Uses Polaroids patented Polarizing technology to give you total on location control of color saturation, make skies bluer, grass greener-even eliminate surface reflections from glass and water - all with picture perfect results Color Coded For Easy Identification Fun, Sporty, Stylish Colors For The Hip And Trendy Photographer For All Ages Precision Machined, Aluminum Rings High Index Optical Glass Maximum lIght Transmission