Solid optical glass. Each individual filter is heat-treated to avoid any rare movement or distortion. UV Filter: Protects your lens from scratches and fingerprints Removes and absorbs ultra violet rays, giving sharper contrast to your video and digital images Diminishes ghosting effect from reflected light CPL Filter: Removes unwanted reflections from non-metallic surfaces such as water or glass Increases color and contrast by redcing reflections from non-metallic surfaces by cutting through haze Improves clarity of distant objects Foliage is richer, skies bluer FDL Filter: Allows camera use under fluorescent lighting Gives natural light colors when under poor conditions Filter Case: Easily stores the included UV, CPL, and FDL filters when not in use Keeps your filters well preserved, maximizing longevity